They were in production up to 1974. METHODOLOGY FOR XRF PERFORMANCE CHARACTERISTIC SHEETS Technical Branch National Program Chemicals Division Office of Pollution Prevention and Toxics Office of Prevention, Pesticides, and Toxic Substances U. Hickok Tube Tester. Sound Clips page - Tube amp sound clips and tunes of all types. When the grid bias is properly set, the tubes are balanced in the circuit and produce a clean, powerful signal. Tube and Bias Info. Enter values in blue and click any Calculate button. You can actually plot tube curves on this device. The calculator will give you the bias current for each tube. Product Review - A Comparison of 6550 and KT-88 Power Tubes - June, 2002 Jason Serinus. There is a 22V zener diode that regulates the voltage that powers the reverb and biases the preamp that needs to be taken into account. With circuitry borrowed from our most advanced. mike Mike's Corner, Vintage Restorations 6sn7, amp, amplifier, bias, capacitor, dynaco, kt88, mark iii, modification, monoblock, power, restoration, upgrade Recently we had an original owner pair of Dynaco Mark III amplifiers brought to us for restoration and modification. However, this is not. Marshall 200 Amp, 200W head. 3V) and current readings taken, the entire set of curves are produced in one capacitor discharge. All the major brands are covered. As a result, many of the handbook designs did not take full advantage of the 6L6 in RF class C operation. Vacuum tubes are an older technology not often used today, but they still show up in some amplifiers and other devices. Abstract: 5881 5881 tube tube 5881 tung-sol 5881 6l6 ultralinear 6L6G tube RL 1962 triode push-pull circuit. Any Penthodo grid bias are less than Triodo's bias so please try to use any kind of driver. Members' Systems. Triplett 3444 with digital plate current meter, tube analyzer and tester for sale. If you have an amp which uses power tubes which are not listed above, you will need to consult a spec manual (the RCA RC-30 Receiving Tube Manual is one of the best) for the basing, and adjust. This is also related to the matching of the valves. If your tube isn't listed then pick one with the same Max Dissipation Rate which is shown to the right in the tube list. The price is right, the performance is off-the-chart good and you can connect it to just about anything. that it is running within spec. Using four KT88 power tubes, these amps were very powerfull, very loud and very expensive. For a quick test, inspect the tube for signs of damage and listen to the sound it makes. Uses a bridge rectifier. Remember VAC’s Phi 200 amplifier, the one whose KT88 tubes range in price from $40 to $400 each? The EAT tube is the one at the high end of that spectrum. The 102D’s are supposed to draw 1 Ampere through the series coupled heaters. (5) Why not - Jim Smith 11:28:53 02/13/10 (0) ; RE: Quicksilver KT88 blowing fuses/possibly power tubes-could a bad 5AR4 rectifier cause this? - Astroimage 10:08:48 02/13/10 (3) RE: Quicksilver KT88 blowing fuses/possibly power tubes-could a bad 5AR4 rectifier cause. Original Traynor YBA-1 used 7027 which has 0. Since even tubes of the same make and model can sound different, I find that is the best way to go to get the tone I am after. In addition, when changing to a higher output rectifier in a "self biasing" (aka "cathode biased" amp, eg, Champ and others) never assume that the power tube (s) is/are safe. these are hands down the best 6L6 type tube i have tried. For a single channel, I need 2 tubes, 1 bias power-supply, a highly regulated power supply and a phase shifter. Electro-Harmonix owns 100% of the largest remaining vacuum factory in the world. Compare Now site51500000000128400 1500000138194. Disregard all advice pertaining to gain and tone from this user if you are under the age of 40 and play thrash. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4. Wide asortment and models up to 560 V. For amps with cathode bias resistors you can simply measure their voltage drop and use the Tube Dissipation Using Cathode Resistor Voltage Drop calculator. You'll need a 1-ohm resistor for each power tube in the amp. With a cathode bias, you do not adjust the grid bias because the thing is self-biasing. He is the author of The Guitar Amp Handbook, The British Amp Invasion, Guitar Effects Pedals, The Fender Telecaster, The Gibson Les Paul, and a dozen other books, in addition to being a regular contributor to several prominent guitar magazines. I am wondering what is the problem with using 220k since my current build uses a LARMAR Master which is just over 225k. test data roll chart housing. This is one of the most affordable tools to measure an amp's bias, and see how two tubes perform at the same time. ) will change optimum plate to plate load impedance. balance potentiometers between KT88/6550’s should be set in the mid-position. This bias manual is a good start, but the values are too generic to use for the KT88 as the bias value for its optimal operating condition on Lumley amp. A better conversion would offered by a 180-ohm resistor, which would set an idle current of 100mA through the output tube and offer a conversion ratio of 55mA per input. Consult an amp tech if you are unsure. Amplifier and amplifier modification kits. The fixed bias output stage offers wonderful punch with a smooth break-up when pushed. The 12 VDC PS powers the input/output and bias relays. There is talk of setting the bias “cool” or “hot” and the effects on output valve life. With a gold-plated molybdenum alloy grid and carbon -coated screen grid, the Svetlana KT88 is the finest power tube of its type be ing manufactured today. Rotate all four bias adjust controls located on the rear of the chassis (V7, V8, V9 and V10) fully clockwise for maximum bias. Some old radios had 3 batteries, Filament, Bias, and Plate supplies (yes a small horror then) The below radios use 75mA of filament current alone, 10 times what the transistor radio needs to operate. 5V grid line and the 1. If you want to compare only two tubes, you can input “2” for the C and D tube to hide tube C and tube D. no bias adapter required. Marshall had to go with other tubes, like the 6550 or KT77 (and then even back to the good old 6L6). · Width, Height – size of the chart. I do know the bias current requirements for the 6550's, KT88's & KT90's when I was using Manley monoblocks, which required individual biasing. KT90 and types and brands exist, and what you can do with the this tube. We agreed that I’d throw a few of my own tubes, including the Tung-Sol EL34B and Shuguang 6CA7-Zs I purchased from thetubestore. 7mA 88mA 3B2 25KV 1. Class 2 - Energy Limiting Transformers. In this article, the 6550 is used in a clean, sweet-sounding, single-ended design. The monoblock tube amp kit uses an SRPP input stage with 5751 driver tubes and a push-pull output stage with KT88 power tubes. This tube is a drop-in replacement for KT88s no special re-wiring required! The KT120 is rated to have a plate dissipation of 60W compared with the 35W of the 6550, the 42W of the KT88, that's a lot of juice! The KT120 also draws more filament current from your amp's output transformer(s). If you are uncertain that you are experienced enough to work on a live high voltage amp, please take your amp to a professional to get it biased. Technical and amp service information. Great Prices! I have four single tubes (two could probably be used as a pair) for $89. Latest: What are you listening to right now and on what speakers squirrelnest, 12 minutes ago. —more about the bias laterThe Rogers EHF-100 is a fully Class A amplifier. Many articles have appeared regarding projects using one of the most sturdy, versatile, and trustworthy audio tubes ever made — the 6550. - MCS 3865 integrated amplifier *SERVICED* 100 % working. Update December 3rd 2019: Added example valves Type 80, ATP4, 6V6G and 6SQ7. select the first character of the tube. You just need to confirm with Rogue the correct bias for other tubes. The tubes will be running at a slightly cooler bias, but many customers have been using these higher dissipation tubes with great success. Weber Speakers Homepage --- Loudspeakers, components, and equipment for the vintage musical instrument enthusiast. 23 Watts For the JJ 5881’s 14 watts for 6V6’s 35 watts for KT88’s and 6550’s Example: 25 watts divided by 480 =. The EH 12AT7 is a good choice for reverb driver, line stage, and phase inverter positions. EL34 KT88 5881 6L6 KT66 6550 Vacuum Tube Tester Amplifier Bias Current. Manufacturer's data is available for triode operation of some popular types of tetrode, pentode and beam power tubes such as EL34/6CA7, 6V6GT, KT66, KT88, 807, 6146. supplies bias and screen voltages for the tester. Product Review - A Comparison of 6550 and KT-88 Power Tubes - June, 2002 Jason Serinus. Click here to buy complete sets of tubes for your Z amps from The Tube Store. 1954 (and very obolete even then; see TR1). 5 @ 50 Watt Zener diode is mounted on a heatsink and used for bias and limits the idle current. Electron tubes are almost outdated, but there was one time when the electron tube. V6-V9- 6L6GC (50/100 Watt) and KT88 (150 Watt) Output Each fine production tube is tested and matched to our exacting specifications. ! After changing tubes always turn all the bias trimmers’ counterclockwise (cold bias) with bias screwdriver, before turning on the amplifier. thank you very much larry, that was a generous gesture. Environmental Protection Agency 401 M Street, S. This is the lower portion of the chart, the "comparative study". The author cames no responsibility for any information provided. The letters "FS" and "RL" in the SIG VR column represent "full scale" and "red line" respectively. 09% at just before clipping (82 watts each at 8 ohms) (Of course Woody had tweaked the bias reading on the regular service bench in the back of the. How you operate the tubes (ultra-linear, bias, plate voltage, operating points, etc. The line-only integrated amp can also be supplied with an optional phono stage. proper tube tester calibration, hickok tube testers, tube tester restoration, restoring tube testers. You may like that. 50 volts over a 10 ohm resistor on each tube. The purpose of this KT88 / KT66 /6550 / KT90 / KT120 page is to give an overview about what KT66, KT88. In the JD-1000P Level-2 mod we do the following [retrofit $1,000 + frt to your amp, New modified units are $2,790 + frt]:. Changes/experimentation with resistor values in circuit 6. Tung-Sol KT120 Super cool KT88 variant made by New Sensor in Russia. com offered a set of five EL34-type tubes for review (JJ KT77; JJ EL34 II; Svetlana EL34; Genalex Gold Lion KT77 and Mullard EL34) I jumped at the opportunity. Internal construction provides mild microphonics resistance. t = Triode Unit. Marshall 200 Amp, 200W head. For amps with cathode bias resistors you can simply measure their voltage drop and use the Tube Dissipation Using Cathode Resistor Voltage Drop calculator. The KT88 / KT66 /6550 Directory. The KT88 is a beam tetrode / k inkless t etrode (hence "KT") vacuum tube for audio amplification. Determining the required value. One thing you also need to consider is the amount of current draw that they have. Hi music men (and women), I've recently put some KT88s in my sixty five at a reputable tech in Manchester (UK). The purpose of this KT88 / KT66 /6550 / KT90 / KT120 page is to give an overview about what KT66, KT88. KT88 BEAM POWER TETRODE T he Svetlana™ KT88 is a beam power tetrode having a large standard octal base and glass envelope. We have researched the proper grades to get the bias right where is should be with no bias mod. The monoblock tube amp kit uses an SRPP input stage with 5751 driver tubes and a push-pull output stage with KT88 power tubes. JJ Electronic KT88 Factory Data Sheet: KT88 Factory description: Has more power, a wider frequency response and dynamic range than any other KT88/6550 on the market. All the major brands are covered. The RF in and out relay is energized first and then the bias relay is energized last. Rectifier comparison and interchangeability chart. This calculator uses the power equation. Amps with an adjustable (referred to as fixed) bias system, input a bias voltage on the input grid of the tube to regulate the current. For a single channel, I need 2 tubes, 1 bias power-supply, a highly regulated power supply and a phase shifter. or any other commonality for that matter. Given below is the tube amp bias calculator to find the bias in ampere or milliampere (mA or A). Amplificatore a valvole - Italian DIY SE amp with EL34 or KT88 Amplification audiophile et DIY AWG to Metric Conversion Chart - For Self Bias- DIY Ultra-Fi. Change resistor between bias pot and bias diode to 10K. You can find kits in the online store! In case you have heard horror stories about the metal bases being connected to a pin and causing shorts, the culprits are the sovtek KT88 and KT66 tubes. I think it's the greatest amp ever made, next to the Ampeg Gemini I. 495,-- SPIRIT III Integrated or Power amplifier; 2x55W Pentode or 2x35W. Tube Charts $ 29. I would hazard a guess that a KT120 tubes bias is 500mv, but I cannot confirm this. 40 and the amp made my HF section a lot louder. All parameters, plate voltage, grid bias, etc, can be adjusted and monitored. later i might try a 6sl7 im not very familiar with those. Even at its attainable price, it outperforms other integrated amps costing many times more. An audio frequency generator was used to sweep from 10Hz to 20kHz with the input voltage measured at the 6L6GC control grid ( ) and the output voltage measured at the output transformer secondary winding while connected to an 8 ohm load. I set them though around 140 MA, and I got them for $450 USD all in at upscale. The calculator will give you the bias current for each tube. 1mA plate current line, at a quiescent plate voltage of 190V. hp = Heptode Unit. Class A operation is often found in high-end audio, but less often in guitar and bass amplification. EL34 Power Tube. Using four KT88 power tubes, these amps were very powerfull, very loud and very expensive. To keep the math simple, lets assume an output tube is supplying a 100 volt ac signal to the primary of an output transformer with a 10:1 winding ratio, and the secondary is feeding a 10 ohm voice coil. Jim Jones' Bias Tables Click here to vist the "House of Jim" Website. thetubestore. If it is 1-ohm, then the conversion ratio would be 1V/1-ohm = 1A, which would be far too high for most output tubes, such as the 2A3 or 300B (or triode-connected EL34 or KT88). 新作商品,人気の春夏 Durpower Phonograph Record Player Turntable Needle For JVC MODELS LA120B L-A55 LA55 L-A90 LA90 L-A100(SOME) LA100(SOME) L-A100 LA100 by Durpower B0176L0K9Q 素敵でユニークな,Durpower Phonograph Record Player Turntable Needle For JVC MODELS LA120B L-A55 LA55 L-A90 LA90 L-A100(SOME) LA100(SOME) L-A100 LA100 by Durpower B0176L0K9Q - virginianewssource. Tube type: ----Choose---- 6V6 EL84/6BQ5 5881 EL34 KT66 6L6GC KT88/6550. Select the Tube Type from the scrolling list. a push-pull amp. Input impedance 250k. PI BIAS SHIFT – Controls the amount of phase inverter bias shift. Change resistor between bias pot and bias diode to 10K. Bias is the negative voltage we put on the control grid of a tube to make the tube conduct the current we desire. 6DG6GT : 6. So that's quite a big difference. DIY KT88 Push-Pull Monoblock Tube Amp Kit - 30 November 2009 KIT A build and review of the Odd Block KT88 Series 1 Tube Amp Kits. Tube tester data roll chart. 5V, -1V, -1. Tube Type. Right bias adjustment: Controls the bias of the right output tube, V4 (See tube chart on pg. It sounded great, but I thought that V4's were made to run with 7027 or 6L6 tubes. The Tube Amp Schematics Library. I hope your tech had a schematic and didn't just install a bias pot willy-nilly. 1: RE: Jackson 648A Tester Settings (10. Even at its attainable price, it outperforms other integrated amps costing many times more. 6V6: pdf Bold designators are close or identical, Italic designators are different ratings, different pinouts or different filament voltages. 1: Easy SET: just disconnect the input to one KT88: this will damage nothing unless your KT88's are DC coupled. What is Bias? Bias voltage is the voltage difference between a tube's cathode and control grid. Found 148 records in Search of Tubes Asylum. Re: Push-pull emitter follower amp (LTSpice) The second circuit does not work as a current amplifier, because the power supply ground connection is missing. Single-ended EL34 amps are fairly rare in the guitar world, for a couple reasons (one being SE amps are usually designed to be less powerful so it makes sense to use a smaller tube, and also output transformer for SE are much heavier and expensive so the smaller the "better"). T are many charts online that will give you the proper range of current for your tubes. KT88 - Kinkless Tetrode Power Tube - The Tubes that made Rock 'n' Roll - Power Amplification Tags: vale, poweramplification-marshall, stack, power, amplification Available in Plus Size T-Shirt. When the. For the tubes, I decided to use some KT88. They seem to bias very hot when you use them in place of a 6L6GC. This means that the bias is made by the current through the resistors R3 and R4. All the major brands are covered. Asortment of more than 30 types of vaccum tubes. For a complete explanation of each column heading, refer to TM 11-6625-316-12. A super value compared with TV-10 and TV-7. Not to be outdone, Sylvania introduced fat-bottled 6CA7 in US soon after. Use this tool at your own Risk. Brand bias disclaimer: I own and play a Blackstar Artist Blonde 30W 6L6 2x12" combo amongst others, but I'm not blind to other brands also owning two Fender amps one of which is a 2x12" solid state combo I'd buy again. DVL-1 100 Watt Head $3,799. com over the years. This rugged tube also found a home in the '59 Fender Bassman and servo amplifiers used in B-52 bombers. I would also check on the Net as they have the bias requirements for the KT120's, another area to look for would be to ask TungSol directly. If you are uncertain that you are experienced enough to work on a live high voltage amp, please take your amp to a professional to get it biased. They might use charts or manuals that say what the correct reading for a particular amp should be, and this is often a bit off as different amps have different B+ voltages. Electron tubes are almost outdated, but there was one time when the electron tube. The class AB push-pull output circuit is slightly less efficient than class B because it uses a small quiescent current flowing, to bias the transistors just above cut off as shown in Fig. Preamp Tube - SPAX7-A. another feature not found on most Hickok checkers. these are hands down the best 6L6 type tube i have tried. 50 volts over a 10 ohm resistor on each tube. To create this article, 21 people, some anonymous, worked to edit and improve it over time. You might not realize this in the simulation as the input source will drive the output instead. 12 volts AC input produces a B+ of. Preamp Tube - 12AX7. The chart I provide at the beginning of this article shows a 6L6GX, which is likely unavailable as NOS these days. I don't know what's a good bias, but I suggested 44 mA, as that's lower than some 6550 bias settings I've seen online, and at the same time isn't very low. Of course, there are the usual 6V6, 6L6, EL34 and EL84, but Bias Amp 2 adds additional tube models, the 6550 and KT88, which provide the drive for many classic amps. Compare Now site51500000000128400 1500000138194. Among my first equipment reviews for this website was an evaluation of the Bruce Moore Dual 70 tubed power amp. Disregard all advice pertaining to gain and tone from this user if you are under the age of 40 and play thrash. ) will change optimum plate to plate load impedance. In this article, the 6550 is used in a clean, sweet-sounding, single-ended design. Bias Vdc for 8 x adjust pots for fixed bias = 135Vdc x 0. Electro-Harmonix owns 100% of the largest remaining vacuum factory in the world. The negative grid voltage method: This method involves measuring the DC voltage on the grid of the output tubes, and setting it to a recommended value. At that time, I praised everything about the amp save for its excessive sweetness. thetubestore. Each tube will have a different effect on the sound. The amp tech asked what I'd like the amp to be biased to. 50 Shipping. 1, but the crossover distortion created by the non-linear section of the transistor’s input characteristic curve, near to cut off in class B is overcome. Change bias potentiometer to 33K or 47K. The anti-biasing constants are typically found in the appendices of textbooks. Unique multi-section design. 5932, 1614, 6L6Y, and other glass 6L6G/A/B types The metal 1614 and 6L6Y types enjoy a fine reputation in some McIntosh amps. How to test KT88 tubes (Last updated: 14-Mär-2017 17:41) The KT88 tubes is a curious tube. Generally, guitar amps that call for a 6L6GC cannot use these tubes without bias circuit adjustments or even modifications. EL34 KT88 5881 6L6 KT66 6550 Vacuum Tube. Built in “Easy Bias” Meter Hand wired point to point Class A, Triode front end. The KT88 is unique in that it behaves a little like a cross between a 6L6 and an EL34 with smooth silky upper harmonics and good bottom end clarity. It is like matching the engine RPM to the proper gear in a race car to achieve optimum performance for the desired speed. In this article, the 6550 is used in a clean, sweet-sounding, single-ended design. 95; Back in the late 50s-early 60s, Harman Kardon manufactured a 60-watt push-pull tube powerhouse called the Citation II. Amplifier gain is 20dB. ) will change optimum plate to plate load impedance. 8A 1400V 350mA 1200mA 5W4(GT) 1. The tubes will be running at a slightly cooler bias, but many customers have been using these higher dissipation tubes with great success. KT88 BEAM POWER TETRODE T he Svetlana™ KT88 is a beam power tetrode having a large standard octal base and glass envelope. these are hands down the best 6L6 type tube i have tried. 495,-- SPIRIT III Integrated or Power amplifier; 2x55W Pentode or 2x35W. The 5881 should break up earlier. Please average the two Bias Readings for one channel, and note the "Averaged Bias Reading" for that channel. A vacuum tube replacement device includes an indicator. V6-V9- 6L6GC (50/100 Watt) and KT88 (150 Watt) Output Each fine production tube is tested and matched to our exacting specifications. Tube rectification duties are from my head stash of Mullard brown base CV1377 (military grade GZ34). The Still Audio EL84 integrated amplifier is much more evenly balanced bass-to-treble than my Almarro EL84 integrated amplifier. Marshall Heaven Schematics shown in BLUE are missing from the archive. Today, there are a number of quality KT88 tubes available for audio and guitar applications. 300B Triode Vacuum Tube Comparison Review The Cardinal is a self bias unit with the B+ set at 400 volts with a median current of 65-75 milliamps. Total maximum power to amp from all Secondary windings of PT = 399W + 120W + 2. Maybe even turn it up, it depends on how you like it really. 5 watts So, 24. That would demand a supplied Voltage of 2V+2V+1,5V+1,5V = 7 V. Kit builds one bias probe to be used with a multimeter (Get Yours Here). They cost $17,000. 5 Watts max Mutual. The amplifier has very few. d = Diode Unit. All these links open in a new browser window so that you can return quickly to this page without having to reload. Page 14 Power On The BIAS ADJustments were made during the final Input Switch testing of the MC2000 at the factory. Electro-Harmonix owns 100% of the largest remaining vacuum factory in the world. 1: Easy SET: just disconnect the input to one KT88: this will damage nothing unless your KT88's are DC coupled. Use the bias calculator to determine the bias level desired - adjust the trip pot accordingly. With a bit of work they lend themselves well to high gain and high speaker load mods with KT88 style tubes. 5 watts divided by a plate voltage of 450v would = 0. Internal construction provides mild microphonics resistance. We agreed that I’d throw a few of my own tubes, including the Tung-Sol EL34B and Shuguang 6CA7-Zs I purchased. Available immediately. It was designed by Stewart Hegeman and weighed. We have researched the proper grades to get the bias right where is should be with no bias mod. Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-C, Cathode Current) 4. In the case of this amp with EL34's I would personally bias the power tubes around 30 mA. Measuring Device For Bias Four octal socket adapters, For the control of the retirement, At 6L6GC, 6550, EL34, 6V6 GT, 5881, KT88, KT66, KT90, KT100, 7027A, With illuminated display, Made in Germany. EL34 handled lots of power in a small envelope. This calculator is for a single tube. Electron tubes are almost outdated, but there was one time when the electron tube. The computer interface (Top Right) is a “Brainbox” US-159 isolated USB to RS232 interface, providing a galvanic-ally isolated USB connection to my PC. Should you be part of the audiophile world and need a second system, or if you are a current Naim owner wondering if the Qb passes muster, the answer is “without. 1954 (and very obolete even then; see TR1). Tube Type. I tried using the 667-7511 settings for 6550s, but the Genelec KT88 (NOS) seems to require a different bias. Everyone please stay safe and we are filling orders daily. cv5220, kt88, kt88s, kt88sc, kt90 Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. The rig as far as the power supply is concerned was solid stated and the audio driver transformer was removed in favor of a phase splitter. 3V) and current readings taken, the entire set of curves are produced in one capacitor discharge. They might use charts or manuals that say what the correct reading for a particular amp should be, and this is often a bit off as different amps have different B+ voltages. And many European tube manufacturers soon started manufacturing EL34. With a cathode bias, you do not adjust the grid bias because the thing is self-biasing. An ECC82 was used as the driver tube for the four KT88's. An audio frequency generator was used to sweep from 10Hz to 20kHz with the input voltage measured at the 6L6GC control grid ( ) and the output voltage measured at the output transformer secondary winding while connected to an 8 ohm load. I've been using the EH KT-88s and the older EI KT-90 Type IIs in my Mac MC-75 monoblocks. In these calculations, 5% of the cathode current is assumed to be screen current. Because of our tradition of supplying the highest quality tubes, we are. It was designed by Stewart Hegeman and weighed. We stock original Marshall switches and logs, cab feet, ohms selectors and voltage seletors. The 10K (R1) biases the tubes to cut off in standby receive mode. ) will change optimum plate load impedance. Then boost the front of the amp with something that removes some lows and low mids and adds highs and high mids. Please make a Donation if you have them. Compare up to 4 items: Clear Selection. If you have an amp which uses power tubes which are not listed above, you will need to consult a spec manual (the RCA RC-30 Receiving Tube Manual is one of the best) for the basing, and adjust. The EZ bias system uses LEDs so no meter is required. It uses a complement of 12AU7 and 12AX7 valves in the gain stage, and comes stock with a set of EL34 driver tubes which can be swapped out for KT88 or 6550 tubes by means of a simple bias adjustment. I don't know what's a good bias, but I suggested 44 mA, as that's lower than some 6550 bias settings I've seen online, and at the same time isn't very low. Rectifier comparison and interchangeability chart. (I listen to classical music and opera. t = Triode Unit. The new $10,000 Sigma 170i iQ represents the lowest cost VAC amplifier to date but includes the company’s continuous automatic bias system and can deliver a healthy 85W per channel from its quartet of KT88 power tubes. Based on the original from 1971, the Ampeg V-4B 100W all-tube head embodies the legendary tone of the classic V-4B in a tough-as-nails package, ready to take the stage with the flexible output control and pure vintage Ampeg grind you crave at volume levels. 6V6, 6CA7, KT77, KT66, KT88, 6550 etc. When using multiple speaker cabinets refer to the back panel Speaker chart for the proper Impedance Selector position. Product Review - A Comparison of 6550 and KT-88 Power Tubes - June, 2002 Jason Serinus. The McIntosh MC2301 300 Watt vacuum tube amplifier delivers the most extraordinarily lifelike and dynamic performance ever heard from a McIntosh tube amplifier. thetubestore. All parameters, plate voltage, grid bias, etc, can be adjusted and monitored. At that time, I praised everything about the amp save for its excessive sweetness. 2 POWER TUBE GRID BIAS. Transformer wiring diagrams. Electron tubes are almost outdated, but there was one time when the electron tube. Tube Type. In his email he told me he was looking to get a new tube amp and was concerned about the wattage. 205) I have a Jackson 648S and the scroll doesn't show an EL34 but the Jackson Special Tube Data book shows it to be a 6CA7 equivalent or similar. A small Fender amp with one 6V6 and 3 watts is operating in class A. This amp does not have user-adjustable bias settings, a common feature of most all Mac amps. The setting is locked in place by the outer locking nut. KT88 Author: M-O Valve Subject: JA-FP-2000-10-01 Created Date: 10/1/2000 7:35:29 PM. Page 27 FINAL INSPECTION Visually inspect all connections and wiring comparing against the master charts and manual. KT66 EQUIVALENT = KT8C GEC (England) It is a beam power tube almost identical to the KT66 (made by the same company) EXCEPT that is has a 5 pin british type ceramic base and a top cap anode connection. Brand bias disclaimer: I own and play a Blackstar Artist Blonde 30W 6L6 2x12" combo amongst others, but I'm not blind to other brands also owning two Fender amps one of which is a 2x12" solid state combo I'd buy again. Just 1 volt difference in the bias voltage can make a difference of 10 or even more ma, of anode current. It also seems that it takes a lot more negative bias voltage to bring them down when using them in a fixed bias application. We have found the Surgical Steel to be a stellar pedal platform for 6 string guitar, as it’s high headroom and near endless sustain offers the perfect canvas for a variety of effects pedal configurations. Weber Speakers Homepage --- Loudspeakers, components, and equipment for the vintage musical instrument enthusiast. This list is our current tube type, location and bias points for all of the Dr. 0520 or 52 milliamps X. 70 lbs unboxed; Original price in kit form $159. - Maybe I should divide this "chart-calculator settings" by 2? But why?. This means that the bias is made by the current through the resistors R3 and R4. Va rating for PT = 600VA or higher. Life Test button; Terminals for attaching external self-bias resistor. Tube bias of an amp is used to find the optimum setting for the flow of current in the tube when the amp is idling. How you operate the tubes (push-pull, push-pull parallel, ultra-linear, class, B+, bias, operating points, etc. The module doesn't "know" is if it's adjusting the bias on a 6L6, 6550, KT150 or any other tube. You want to bias so that the tubes are running between 50% and 70%. High-gain guitar amplifiers , are an increasingly popular type of amplifier, built for high amounts of preamp gain, to give a very overdriven sound. They cost $17,000. Most tubes are somewhere in between. 7 POWER TUBE MISMATCH. In fact, a friend give me a spare matched quad of NOS (plain old) Gold Lion tubes + the needed output transformers so. later i might try a 6sl7 im not very familiar with those. The amplifier circuit diagram shows a 2. The sound was reproduced through a 1971 Marshal cabinet with 4 Celestion G12M "greenback" speakers. Troubleshooting Procedures 7. Speaker: 13. The EL34 is found in the most well-known UK heads, such as Marshall, HiWatt, and Sound City. A great sounding EL34 amp is a joy to listen to all day. (5) Why not - Jim Smith 11:28:53 02/13/10 (0) ; RE: Quicksilver KT88 blowing fuses/possibly power tubes-could a bad 5AR4 rectifier cause this? - Astroimage 10:08:48 02/13/10 (3) RE: Quicksilver KT88 blowing fuses/possibly power tubes-could a bad 5AR4 rectifier cause. 205) I have a Jackson 648S and the scroll doesn't show an EL34 but the Jackson Special Tube Data book shows it to be a 6CA7 equivalent or similar. 00 * Tweed One-6 GS, 5F2 Style Amp-Kit Tweed One-6 From €375. I would also check on the Net as they have the bias requirements for the KT120's, another area to look for would be to ask TungSol directly. High reliability and exceptional music - listening experience. WEBER BIAS SETTINGS. An audio frequency generator was used to sweep from 10Hz to 20kHz with the input voltage measured at the 6L6GC control grid ( ) and the output voltage measured at the output transformer secondary winding while connected to an 8 ohm load. wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. When you have the bias checked, find somebody uses a scope if they also use a bias probe. A super value compared with TV-10 and TV-7. Even at its attainable price, it outperforms other integrated amps costing many times more. The data on this page reflects the approximate year that these amplifiers were made and not the actual dates of manufacture of the amplifier. It has test points on the front of the amp to bias it with. Single ended can save a few dollars, though. bias resistor to 47K from 22K in PSU HiV Sec. The KT88 / KT66 /6550 Directory. Discussion in 'Audio Hardware' started by Brian I run EL34's but I am not too fond of KT88's. the chassis is setup for 4 6l6 tubes. Audio Transformers. A full balance EQ section feeds a pair of ultra-linear connected KT88 power tubes. Congratulations on your purchase of the Ampeg V-4B 100W all-tube bass head. Hi, and first of all, congratulations for this nice blog that I just discovered. thetubestore. If you want to use THESE tubes I would disconnect the bias voltage going to pin 1 and recheck that you are still seeing bias voltage on pin 5 !. no bias adapter required. Introduction. Set the bias-x to 0, and the bias all the way up. Built in “Easy Bias” Meter Hand wired point to point Class A, Triode front end. This rugged tube also found a home in the '59 Fender Bassman and servo amplifiers used in B-52 bombers. In these calculations, 5% of the cathode current is assumed to be screen current. Power Tubes - 6L6 STR 445 - Matched Pair. Meter and roll chart are backlit…. Life Test button; Terminals for attaching external self-bias resistor. Many articles have appeared regarding projects using one of the most sturdy, versatile, and trustworthy audio tubes ever made — the 6550. We stock original Marshall switches and logs, cab feet, ohms selectors and voltage seletors. 00 * Tweed One-6 GS, 5F2 Style Amp-Kit Tweed One-6 From €375. Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-C, Cathode Current) 4. 5 SCREEN FREQUENCY + SCREEN Q. KT88 and 6550 are almost same charactor so you can use each other same amplifier. You might not realize this in the simulation as the input source will drive the output instead. This calculator allows you to trace the anode characteristics graph, and to compute and tune loadline and operating point of various vacuum tubes. , and the voltages between the CT and screen/plate taps on the OT to see if there's much difference. The author cames no responsibility for any information provided. The sound was reproduced through a 1971 Marshal cabinet with 4 Celestion G12M "greenback" speakers. A tube manual or tube manufacturer's technical data sheets should be consulted first, before making a decision on a proper output transformer. Most of them show these audio beauties used in the push-pull configuration in order to obtain the greatest efficiency and the most power output. EL84/6V6GT - 12W. They seem to bias very hot when you use them in place of a 6L6GC. The Still Audio EL84 integrated amplifier is much more evenly balanced bass-to-treble than my Almarro EL84 integrated amplifier. If you are uncertain that you are experienced enough to work on a live high voltage amp, please take your amp to a professional to get it biased. Click here to buy complete sets of tubes for your Z amps from The Tube Store. Introduction to Thermionic Valves (Vacuum Tubes). are common guitar amplifier power tubes, and are all easily biased with this method. 5A per tube. Reviews reviews for this product. I tried using the 667-7511 settings for 6550s, but the Genelec KT88 (NOS) seems to require a different bias. Events & Happenings. Fender Hot Rod Deville 212 IV. Class 2 - Energy Limiting Transformers. Plus they match them for free a added bonus. Two easily overdriven cathode-bias 6V6 output tubes deliver a sweet, harmonically rich tone, and the 5Y3 tube rectifier has the sag required for dynamics and touch sensitivity. V1: JJ ECC83, V2: Tung Sol 12AX7, V3/4 JJ EL84 (matched pair), V5: 5Y3. 1nstalling dual-bias control modifcation for separate bias control Of each output tube 8. As a result, many of the handbook designs did not take full advantage of the 6L6 in RF class C operation. 40 watts in cathode bias using a pair of 40 Watt line trannies looks attainable, but 55-60 watts needs a bias supply and our centre-driven multiplier presents problems. We stock KT88 tube sets that are precision matched. Groove Tubes Cross Reference Chart Groove Tubes Part Number Original Part Number GT-6L6B Sovtek 5881WXT GT-6L6S JJ 6L6GC GT-E34LS JJ E34L GT-EL34R Electro-Harmonix EL34. The basis for this amp started out as a post in a thread on the DIY Audio Projects Forum site. Title: 6L6G 6L6 Author: Tung-Sol Subject: FP-2004-06-05 Created Date: 6/5/2004 11:41:47 PM. So the 6L6GC will give you more power and more clean headroom. The 10K (R1) biases the tubes to cut off in standby receive mode. Manufacturer's data is available for triode operation of some popular types of tetrode, pentode and beam power tubes such as EL34/6CA7, 6V6GT, KT66, KT88, 807, 6146. Most of the datasheets are in PDF format and some are links to other HTML pages. Title: 6L6 Author: RCA Subject: FP-1999-02-28 Created Date: 2/24/2002 7:46:40 PM. Due to many requests by fans of our Tung-Sol line of tubes, the Tung-Sol EL84/6BQ5 has been reissued. Shipping: + C $8. Vg = grid bias voltage at the bias point Ip = plate current at the bias point For example, suppose a 12AX7 were chosen, with a plate supply voltage of 300V, and a 100K load line was drawn on the curves, and the desired operating point was the intersection of the -1. It has been in my collection more than 30 years since I bought it from the original owner in Chicago. The 539B roll chart has the settings for KT88's so I didn't think there would be a problem. 2 plate voltages available. There is a lot of discussion on the black magic of setting the bias on the output valves in your amp. are common guitar amplifier power tubes, and are all easily biased with this method. There is a 22V zener diode that regulates the voltage that powers the reverb and biases the preamp that needs to be taken into account. And there is the other thing too, personal preferences, and the amp Itself plays a part (circuit design). Pricing & History. The following tube tester manuals are available at any time. This is obviously nonsense - the valve will (must) be biased normally with zero signal. Orders typically ship within 24 hours. Everyone please stay safe and we are filling orders daily. The amp can also handle the even more powerful KT150. Maximum power input to PT = 444. The pure tube design provides a smooth, almost liquid sound that has made this amp a reviewer favorite. Sound Clips page - Tube amp sound clips and tunes of all types. It has been designed around the magnificent KT120, one of the toughest tubes available. In addition, we offer an array of new "select" Dynakit™ classic vacuum tube. Choosing between EL34, KT88, or KT120 tubes. com offered a set of five EL34-type tubes for review (JJ KT77; JJ EL34 II; Svetlana EL34; Genalex Gold Lion KT77 and Mullard EL34) I jumped at the opportunity. 3 NEGATIVE FEEDBACK. McIntosh Amplifiers Part 2 2-KT88/6550 output, 12AX7, 12AU7, 12BH7, 12AT7/12AZ7. Discussion in 'Audio Hardware' started by Brian I run EL34's but I am not too fond of KT88's. Given below is the tube amp bias calculator to find the bias in ampere or milliampere (mA or A). { "inCheckoutPromo": [] }. The AC heaters are 5 volts. Most tubes are somewhere in between. The McIntosh MC2301 300 Watt vacuum tube amplifier delivers the most extraordinarily lifelike and dynamic performance ever heard from a McIntosh tube amplifier. Amplifier gain is 20dB. Bias for that bank is set. Used to build model 6G15 stand alone reverbs, Re-Vibe's and pre-amps. Aa04-p-sb315346-34 For Toyota Mark 2 Brake Pad Specom-beta Specicon Tester Left. Due to many requests by fans of our Tung-Sol line of tubes, the Tung-Sol EL84/6BQ5 has been reissued. The EL34 is larger and it puts out two to three times the watts as the EL84s. Circuito ZVS, sistema di controllo tensione zero, per la massima stabilità di tensione. ) will change optimum plate to plate load impedance. 70 lbs unboxed; Original price in kit form $159. I had to make a 7dB change to get the HF/LF somewhat balanced back out. Today, class AB push-pull is usually used. Used to power tube pedals. Vacuum tubes are an older technology not often used today, but they still show up in some amplifiers and other devices. I do know the bias current requirements for the 6550's, KT88's & KT90's when I was using Manley monoblocks, which required individual biasing. Dave Hunter is a writer and musician who has worked in both the U. 5V, -2V, -2. Many articles have appeared regarding projects using one of the most sturdy, versatile, and trustworthy audio tubes ever made — the 6550. 5 watts divided by a plate voltage of 450v would = 0. Based on the original from 1971, the Ampeg V-4B 100W all-tube head embodies the legendary tone of the classic V-4B in a tough-as-nails package, ready to take the stage with the flexible output control and pure vintage Ampeg grind you crave at volume levels. De-bias button is pretty cool idea (well, in both means lol). A great sounding EL34 amp is a joy to listen to all day. You check the bias on the EL34s, swap in the KT77s and adjust to match, or a little hotter if you want. This tester is set up by using a tube manual for particular tube being tested. Using grid leak bias eliminated the need for the 'C' battery, which supplied a negative voltage to bias the valves in the receiver. Just 1 volt difference in the bias voltage can make a difference of 10 or even more ma, of anode current. In this old Marshall bias chart for a 2203 with 6550s, it appears to me to be suggesting a bias of 51 mA per tube. However, typically they are pragmatically assigned a significantly higher Grid #2 rating than for either tetrode or pentode connection. In this article, the 6550 is used in a clean, sweet-sounding, single-ended design. This is the Groove Tubes reference chart from www. thetubestore. Marshall Amp Parts for marshall amps. with 50 volt fixed bias output, a 35 watt output transformer, 6L6 power tubes, bigger filter caps and a fixed bias circuit. This was a “Question of the Day” post from Max in Stanhope, PA. One thing you also need to consider is the amount of current draw that they have. EL34 handled lots of power in a small envelope. Power Tubes - 6L6 STR 441 - Matched Pair. A Dr Z Route 666 uses an EF86 in V1, and LTP and a pair of KT66 (UL, fixed bias with 440 on the plates, grids @ -50V) with a GZ34 rectifier. The following tube tester manuals are available at any time. 205) I have a Jackson 648S and the scroll doesn't show an EL34 but the Jackson Special Tube Data book shows it to be a 6CA7 equivalent or similar. The best thing to do is contact Lumley if not contact the people that own them as they should be able to guide you on the proper bias value. You check the bias on the EL34s, swap in the KT77s and adjust to match, or a little hotter if you want. Separate Rhythm and Lead channels with added footswitchable BOOST functions make the Tweaker 88 the decisive choice for live performance, studio or just plain rockin’ out. The KT88 audio tube is considered to be one of the best sounding power tubes for hifi tube audio amplifiers. 6CA7 - America's Answer. An EL34 tube has a recommended bias at around 320mv-350mv. The 811A is a zero grid bias transmitting triode. (Check out the TEA2025 datasheet for more information on that) On the input side, you should use a dual potentiometer. Push-Pull Fixed Bias. As in its other amps, PrimaLuna's Adaptive Auto-Bias circuitry is used to monitor power-tube performance and eliminate the need to buy tubes in matched pairs. However, this is not. Then go back to 300B-chart sheet and input the tube ID there. Back panel has external switching jacks for channel-solo-reverb (footswitch included), parallel effects loop with "mix" control, Bias Switch for EL34 and 6L6 power tubes (a new feature added with the Series 2 models), 8-4-4 ohm output jacks, and slave output. I just did some tube swapping on my Thrasher 120 and am now running 6L6's and KT88's in the power section am very pleased with the results. Chart rolls easily no visible date. Rectifier Tube - 5AR4/GZ34ACF. Click here to buy complete sets of tubes for your Z amps from The Tube Store. Power Tubes - EL34 STR 447 - Matched Pair. I think it's the greatest amp ever made, next to the Ampeg Gemini I. Vacuum Tube Calculators Basic Theory - using 21st-Century technology to design vacuum tube preamps, power amps, and power supplies System Design - a professional methodology for crafting a complete guitar amplifier. Helpful information links. The EL34 is a thermionic valve or vacuum tube of the power pentode type. Plus they match them for free a added bonus. 09% at just before clipping (82 watts each at 8 ohms) (Of course Woody had tweaked the bias reading on the regular service bench in the back of the. It also seems that it takes a lot more negative bias voltage to bring them down when using them in a fixed bias application. The other tube that would run without to many changes is the KT66, in fact the KT66 may sound better, compare the KT88 to a 300B and the KT66 to a 2A3 and you get the picture. Bias current is the amount of electrons flowing from the cathode to the plate with no audio signal on the control grid (idle current). The setting is locked in place by the outer locking nut. Introduction. 036 or 36 milliamps Most 50 and 100 watt amps using these tubes will have between 450 to 480 plate volts so even if you do not measure your plate voltage you will find that a setting between 35 to. As musical tastes transformed from big band to swing to jump. By using a very high value grid resistor and a coupling capacitor from the previous stage, stray electrons from the space charge surrounding the cathode are collected by the grid, and cause a voltage to appear. Have you ever wonder what the difference is between each of the 6l6 tubes, have a quick look at this chart to help you see what the differences are as it just might help you choose. When using multiple speaker cabinets refer to the back panel Speaker chart for the proper Impedance Selector position. Life Test button; Terminals for attaching external self-bias resistor. I also read somewhere that EL34's should dissipate 15-18 watts at idle (the math for 545 volts of B+ equates to 30 mA of plate current). KT88 BEAM POWER TETRODE T he Svetlana™ KT88 is a beam power tetrode having a large standard octal base and glass envelope. After winning the gold medal of『Music Player (¥120,000 to ¥200,000) Category ②』of the Fujiya-Avic Headphone Festival Award 2019 Spring in June, Cayin’s N6ii has received another influential award of the year, the Best All-round DAP of 2019 by Headphonia. The calculator will give you the bias current for each tube. A KT88 could have a power rating of 35 - 45 watts, which would make the calculation for 70% dissipation: So, 70% of 35 watts is 24. Page 14 Power On The BIAS ADJustments were made during the final Input Switch testing of the MC2000 at the factory. Fender '64 Custom Deluxe Reverb 20W 1x12 Tube Guitar Combo Amp. BIAS ADJUSTMENTS:. The letters "FS" and "RL" in the SIG VR column represent "full scale" and "red line" respectively. I don't know what's a good bias, but I suggested 44 mA, as that's lower than some 6550 bias settings I've seen online, and at the same time isn't very low. A Stock 3444 can not read these tubes for plate current, this o. Triplett 3444 with digital plate current meter, tube analyzer and tester for sale. Members' Systems. EL34 tubes factory fitted; can be used with other output tubes (KT88, KT90) Very simple bias setting procedure with LED indicator Quicksilver proven reliability known throughout the world. 205) I have a Jackson 648S and the scroll doesn't show an EL34 but the Jackson Special Tube Data book shows it to be a 6CA7 equivalent or similar. They cost $17,000. A great sounding EL34 amp is a joy to listen to all day. EL34 handled lots of power in a small envelope. DIY KT88 Push-Pull Monoblock Tube Amp Kit - 30 November 2009 KIT A build and review of the Odd Block KT88 Series 1 Tube Amp Kits. Given below is the tube amp bias calculator to find the bias in ampere or milliampere (mA or A). Thanks to the many visitors who have scanned documents and donated images to. t = Triode Unit. I worked this method out not using any kinda. Specially designed heat dispersion wings on the plate add more performance, stability and allow plate dissipation up to 50 watts. Power tubes like EL34's and KT88's are good for about 2500 hours or more. Shipping: + C $8. The OP’s amp can accommodate either an El34 or Kt88 tubes and these aforementioned bias setting are also quoted in the OP. The AC heaters are 5 volts. This webpage offers two ways to calculate tube bias and plate dissipation. Events & Happenings. This rugged tube also found a home in the '59 Fender Bassman and servo amplifiers used in B-52 bombers. Seems pretty straight forward. The KT88 audio tube is considered to be one of the best sounding power tubes for hifi tube audio amplifiers. Negative bias supply is used to supply the 20v 125mA filament power to the C3m, then a doubler boosts this to 140v DC for use of negative bias to the 300B's. these are hands down the best 6L6 type tube i have tried. bias resistor to 47K from 22K in PSU HiV Sec. KT88 BEAM POWER TETRODE T he Svetlana™ KT88 is a beam power tetrode having a large standard octal base and glass envelope. AND has several Western Electric tubes types right on the chart! 300A/B, 101L, 102L, 396A, and 417A! Will also test most common audio tubes like 6CA7, 6L6, 6SN7, KT88, 7247, 12AX, AU, AT, 7247, 7199,7355, 7591 and 7868 (with adapter). EL34 handled lots of power in a small envelope. Twin Tube Amp Bias Matching Meter 6L6 EL34 KT88 6550. thetubestore. This calculator uses the power equation. The OP’s amp can accommodate either an El34 or Kt88 tubes and these aforementioned bias setting are also quoted in the OP. Rotate all four bias adjust controls located on the rear of the chassis (V7, V8, V9 and V10) fully clockwise for maximum bias. The following tube tester manuals are available at any time. d = Diode Unit. 23 Watts For the JJ 5881’s 14 watts for 6V6’s 35 watts for KT88’s and 6550’s Example: 25 watts divided by 480 =. 8 thoughts on “ Optimization of the 6V6 SE-UL ” Alexis Hernández on March 28, 2020 at 10:34 AM said: Gracias, Gracias Matt, excelente trabajo de laboratorio suficiente como para que Yo intente utilizar mis 6V6 GT que tengo por allí y otros 12AX7 que debo conseguir para el pre-Amp. EEG directly measures neural activity. Fender Hot Rod Deville 212 IV. To the point where you have to modify your amp to accept them in a usable bias range.
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