6l6 rf amplifier. ) Both sound quality and tube life/quality.
6l6 rf amplifier Usually 20 watt amplifiers of pre 1955 vintage. I use a BC-348-N as receiver. Description: PENTODE FOR RF AND AMPLIFIER APPLICATIONS. hk? They seems to use quality components from Germany and Japan. Nothing much is said about it. 99 per tube. Radionette amplifier. They are capable of delivering an output at all power levels with a very low percentage of harmonic distortion. QSO with LA5FH in Larvik and LA9WNA in Skien. This is my first test of the 6L6 station. 6L6 transmitter, bottom view. TubeMan. In this Killer Rig article, we’ll take a look at some of the best 6l6 tubes on the market today and see how they compare. It is too unstable to operate straight through on any band but 80 meters, where there is no tuned circuit, only an RF choke in the grid circuit. What iron have you selected?, it does make a difference. Since 40 meters is my favorite band, I decided to make my transmitter for use on that band. At Andertons Music Co. Once you hear a modeling amplifier Hoffman Amplifiers Tube Amp Forum, Relationship between screen voltages and plate voltages in power tubes I drew up a sketch of the schematic. Oct 25, 2019 · I have just fitted a pair of nos GE 6L6GC in my Fender 57 Twin. The 6L6 (in its various iterations) proved to be quite successful, and is still in production today. This 5881 / 6L6WGB was first developed by TungSol for the US Military. The 220 ohm 1Watt resistor in series with the cathode (pin 8) acts as a current limiting resistor. Sep 6, 2020 · A push-pull 6L6 should make 30 watts without issue, possibly more if you push it. Jan 15, 2019 · The 6L6 tubes can produce about twice the power produced by 6v6 tubes, and are famously known for their “big American sound”, bold and solid voice with firm lows and prominent highs. An amplifier tube controls the flow of electrons running through it. The 6L6 tube equivalent part numbers 5881 and 7581A vacuum tubes are acceptable substitutes in some amplifiers. You say yours is 410v depending Created Date4/20/2000 7:20:08 PM The Marblewood was designed as a “first amplifier” project for people who had never built an amplifier from scratch before. Second, I already have a 1-tube transmitter made from a kit that uses a PC board. Jan 27, 2015 · The amp in question using 6L6GC's has 700v at the plates, 22v at the control grid, what gets me is the cathode has a power transistor connected to it, collector is tied directly to 6L6 cathode, emitter tied to ground through 3. W6SAI Bill Orr, in one edition of the Radio Handbook, manages to get a 6L6 RF amplifier to work on 6 Meters, probably just to prove he could. Apr 14, 2012 · The Western Electric Model 142A (6L6 s) uses only a 100 ohm grid stopper! Such classic designers tended to deal with parasitic RF directly using other methods, rather than choke out driver voltages. It was crystal controlled and worked on 80, 40 and 15 meters. Hoffman Amplifiers Tube Amp Forum, Favorite PP 6L6 amp circuit Dec 11, 2012 · This is a 6L6 or KT88 family amp that was an effort between Kegger and myself to try a different triode-pentode driver tube in a cathodyne configuration. It has better shielding and can handle much higher voltages than a 6L6 or 807. Advantages are increased fidelity and stabilized, adjustable carrier RCA had just introduced the 6L6 in July '36, for use in linear amplifier audio stages, and amateurs had quickly discovered its excellent capabilities when used in both oscillator and amplifier service at RF frequencies. Having performed the study of the 6L6 tubes in an SE-UL configuration, and seeing the excellent performance which could be achieved, I decided to put the data into a practical application. I've drawn an awful lot over the years (gosh, come to think of it, I'm coming up on my 10th anniversary of getting a soldering tool :), from Doom levels to mechanical contraptions to metal-melting devices to electronic circuits. 6L6 is the designator for a beam power tube introduced by Radio Corporation of America in April 1936 and marketed for application as a power amplifier for audio frequencies. Class C RF 6L6 tube data The left ad is an advertisement put out by KenRad Radio Tubes for their 6AG7, listing it as their tube of choice for service as a VFO (variable frequency oscillator). 5 250ohm shared impedance: 9,000 output power: 24w If i were to ha e 425V at the plate and fixed bias I'm guessing 60-75ma per tube and maybe 30 watts? Just a rough Oct 1, 2014 · I found a schematic that uses RCA 811s, with a 6L6, and 6SN7, I believe, for teh other stages,,, I was thinking of trying it with a 6BG6 to build a plate cap tube amp!!! This calculator allows you to compute and tune loadline and operating point of tube amplifiers’ power stages, for most common power vacuum tubes. That makes sense; S-parameters are fantastic for modeling small signal circuits. I recently went through my desk drawer, which holds a good few years of scattered schematics, and I'm kinda suprised at how much I knew Another way to get around the 6L6 instability issues was to use it in grounded grid, which got good power efficiency, but had high complexity in interstage coupling networks employing plug in coils. General discussion of modeling and measurement issues welcome. I bias for tone,not for some sense of safety,although i don't intentionally want to burn up a set of tubes. If you have not been trained to work with high voltage then have an amp technician service your amp. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers in the 1960s and 1970s. So, a lot of the literature online talks about using S-parameters to impedance match amplifiers. Another way to get around the 6L6 instability issues was to use it in grounded grid, which got good power efficiency, but had high complexity in interstage coupling networks employing plug in coils. The 6L6 first appeared before the Second World War, and was widely used in many applications, especially in audio amplifier, finding particular favour in guitar amplifiers. Dec 17, 2021 · The oscillator is a 2E26 configured as an Electron-Coupled Colpitts crystal Oscillator, which is capacitance coupled to the modulated RF amplifier. For 4 watts I have plate impedance at 2500 ohms. A Radionette amplifier from the 50’s is power and modulator for the 6L6 transmitter. Can be used Jul 7, 2015 · It has the widest oxide coated cathode of any sweep tube. File Size: 393Kbytes. This should help to make good spice models more generally accessible to the membership. 5 x 400 x . This happens because the tube's grid acts like a detector anode, and will pull the cathode well above the peak positive grid voltage plus the original open key voltage, or at least above a Oct 20, 2019 · Hi to all! I am looking for a 15 to 20 w single ended amp. I tried 6L6, 6P3S, 5881, 6P3S-E, EL34, 6550 and KT88 output tubes. As Nomad mentioned, the version with the single tube inside the glass envelope, is preferable. The Fryette LX II Tube Stereo Power Amplifier has toured nationally with Chris Traynor (Bush), Pete Anderson (Dwight Yoakam), Stephen Carpenter and Chino Moreno (Deftones), Roy Lozano (Power Flo) and others during the artist-only beta release phase. Power amplifier - 6L6. The 807, 1625, 6BG6, 5881, 7581, 6L6, 6L6G, 6L6GB, 6L6GC, and several different Soviet tubes are all electrically quite similar. By the early 1940s, the 6L6 was adapted to the "ST" glass envelope, the then-standard five pin base, and with a top cap connection to the plate. Amp was custom built onto a Magnavox AMP128 chassis- to which a second output transformer The AA8V/W9EXI 6CL6 One-Tube Transmitter - Schematic Diagrams and Circuit Descriptions Power Amplifier Hey guys, I'm building a clone of a small Class A amp and could use a little help with the transformers. when this happens, the audio becomes super muddy, and looses trebble, and the B+ supply increases, it doesnt 6L6 - Crypto Museum 6L6 A Tube-type Class-A DC-Coupled Plate Modulator for Low Power AM Transmitters Home This page is primarily concerned with a method of plate-modulating a class-C RF stage without the usual modulation transformer. The original output tank used plug Oct 11, 2015 · This oscillator circuit is controlled by the Key switch, which opens and closes the path to ground for the 6L6 tube amplifier circuit thereby stopping and starting the oscillation and RF output. It would even make a nifty SET amp! After reading through some articles in old magazines that had belonged to my grandfather, as well as searching the Internet, I decided to build my CW transmitter around a 6L6 tube. The EL-34 tubes produce a little more output than the 6L6’s, and are characterized by a juicy voice with crunchier mids and softer lows compared to the 6L6’s. The 6L6 Beam Power Amplifier A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. This version has a 30 watt plate dissipation, 500V plate rating and 450V 5watt screen rating. we have a great selection of 6L6-driven guitar amps, so browse our range below! Aug 9, 2025 · Rf Amplifier All Band Using Blf200 Low Periced LdMosDIY Project, Eliza Sukiman. The power stage is optimized for the 6V6 but can handle a bunch of other tubes. Two years ago I saw Gary's WD4NKA webs site showing a schematic of a MOPA Transmitter, the 6AG7 / 6L6. This is the tube that is used in the VFO of the Wingfoot VFO Exciter. 6L6, 6L6G, and 6L6GA tubes should only be used in amplifiers with plate voltages under 400 volts. RCA 1941 AN-116 Properties of Untuned RF Amplifier Stages - An analysis of using an un-tuned RF amplifier in both broadcast and short-wave receivers. It provides details on its uses in audio and RF applications, its differences from similar tubes like the 6L6, variants of the 807 tube, and its role in amateur radio. A unit which has been properly designed from phono input to power output will give that wonderful tube sound that makes listeners mouths drop open in amazement. At the time (with a certain budget restrain) I ordered components that would allow me to The open key voltage of 75 volts further increases if the oscillator is running, as in the circuit above, driving RF voltage to the final amplifier grid. There are a whole host of 6L6-oids that will all perform well here. A poorly designed output can make an otherwise good amplifier sound terrible. Mar 24, 2012 · The 6146, however is a totally different animal basically designed for RF amplifier service. Oct 5, 2020 · Power amp tubes can make a huge difference to your guitar tone. Manufacturer: General Electric Company. Complete RF 6L6 Class C RF specs for AM, CW, discussion 3 Schematics of AB2RA rig, 6V6 with dual output power supply for chirp reduction and receiver protection T/R switch (3 sheets) The 6L6 was released in 1936 and was first announced on page 50 of the May, 1936 issue of QST magazine. The design is no more complex than a traditional high fidelity tube type modulator using a modulation transformer. Following the introduction in July of the 6L6, the potential of the scaled. A list of our Tube amplifiers organized and shown by power tube type - 300B, 2A3, PX25, EL34, 6L6, KT88, KT120, KT150, 6C33C, EL84. Remember, the 6L6 stage MUST multiply by two as a frequency doubler. I've been using them ever since in every application from a single tube grid driven amplifier, to six in parallel. The 6L6GC is the latest version of the 6L6 tube. Forming the electrons into beams increased the space charge near the plate, which then repelled secondary electrons back to the plate Feb 4, 2015 · 425V B+ 6L6GC 4k center tapped ot Push pull class A Fixed bias TDSL says this for cathode bias: B+ 360 Vg2 270 Ia 50 Ig2 9. 080 or 16 watts Audio output in watts From the tube table it is found Nov 10, 2019 · DIY Vacuum Tube Amplifier Projects Do-It-Yourself (DIY) vacuum tube (valve) amplifier and tube preamplifier projects. Dec 22, 2005 · Wurlitzer had a 6L6 amplifier that used a 6SN7 front end in concertina driving the 6L6's. Sep 29, 2016 · What this means, according to Bartel, is that you cannot simply throw a set of EL34s into a Fender Deluxe Reverb and expect it to sound or feel like a Marshall Plexi or JCM 800. The Elekit TU-8200R Stereo Tube Amplifier Kit allows the builder to enjoy exquisite vacuum tube audio. JJ T-6L6GC-JJ-MP Electronics Amplifier Tubes (Editor’s Choice) The JJ Electronics’ T-6L6GC-JJ-MP amplifier tubes find widespread application in guitar amps serve as the yardstick for all 6L6 tubes. Matched pairs, quads, and octets are available 1. Re: 6V6 Beam Power Pentode for a Regen Radio Audio Amplifier Is the other triode being used for a RF amp or the first audio stage? The 6N7 looks to be a great tube for making a mid-power push pull triode amplifier. Also, in 1950, an important article in QST magazine, "Crystal-Controlled Oscillators, A Review of Modern Crystals, Circuits and Tubes" (QST, March 1950, C Screen current at idle for the 6L6 is pretty small, so it would take high-valued resistors to really lower screen volts. In fact, the ratings of the 6L6 are specified only to 10 MHz in RF class C service. com. International shipping to most countries is available. If the amp sounds good at 51ma and you are not diming all the time,leave it alone and see if the tubes will last. I have checked the biasing Tube 1 = 33 ma Tube 2 = 37 ma Is this a close enough match, I usually bias my 6L6GC to 36 ma 6L6 General Electric Metal Beam Power Amplifier Tube(LHP) The 6L6 is designed with high power sensitivity and high efficiency for service in the output stages of AC receivers. Part #: 6BA6. One of the most popular applications of the 6AU6 low noise RF pentode was in the World Audio Design K6L6 integrated amplifier back Apr 13, 2021 · Now I can say without a doubt in my mind that my scratch built 6L6 Push Pull Stereo Tube Amplifier is finally complete with proper voltages and all!! All recycled parts. The 6L6 was released in 1936 and was first announced on page 50 of the May, 1936 issue of QST magazine. I am trying to tune/tweak/repair this transmitter for a friend of mine. Title: Re: PW 6L6 RF Deck Post by: kb3ouk on April 23, 2011, 12:46:57 PM would probably work real nice to drive an amp with Title: Re: PW 6L6 RF Deck Post by: Ralph W3GL on April 23 Looking for 6L6 Guitar Combo Amps? Sweetwater has Easy Payments, FREE Shipping, and FREE Product Support for Guitar Combo Amps! Feb 12, 2022 · I am building a push pull 6P3S (6L6 equivalent) amp, and I cant find a way to fix what I asume is it oscllating. Jan 1, 2021 · 6L6 vs 807 vs 6146. JJ Electronics is celebrated for creating performance-driven heavy-duty preamp vacuum tubes, and the T-6L6GC embodies JJ’s commitment to high-quality manufacturing. This RF version became the 807. So my doubt is wha tube is the best option? 6dq6b or 6l6gc or another? Jan 15, 2013 · The 6L6GT with a tubular glass envelope appeared by the early 1950s. I bought sleeves of these tubes years ago for $4. I also have many of the 9 Another way to get around the 6L6 instability issues was to use it in grounded grid, which got good power efficiency, but had high complexity in interstage coupling networks employing plug in coils. . Now we have reached the part that can make or break an amplifier design. Many Deluxe owners have fitted a 6L6 output pair in their amplifiers and find that they prefer the sound and tone with these alternative valves. Sep 15, 2020 · 6L6 tubes are known for their warm, well rounded tone, which means they’re a great choice for both modern and vintage amplifiers. 15vAC, 6. Best 6L6 Tubes When selecting new power tubes for your amplifier, there are many things to consider. I use a Pi tank circuit to couple the output signal to the antenna. ) Both sound quality and tube life/quality. It is oscillating, and it has rf power on the antenna, but it just doesn't seem as "strong" as it should be. 3 days ago · Williamson 6SN7 - 6L6 (KT66) Tube Amplifier Page 1 of 1 [ 5 posts ] Page 1 of 1 [ 5 posts ] Nov 8, 2014 · Hi, I'm new to tube. The original circuit was a simple MOPA (Master Oscillator, Power Amplifier) design that used a 5763 pentode and a metal 6L6 beam power tube. 9R resistor. [1][2] The 6L6 is a beam tetrode that utilizes formation of a low potential space charge region between the anode and screen grid to return anode secondary emission Dec 28, 2018 · Keroes rarely supplied any information regarding tap placement of their transformers -- except of course for the article launching their inaugural UL amplifier specifying 43% for 6L6 tubes, and in an article he did wherein the TO-310 is retrofitted to a production 6V6 amplifier. Please be aware that most of these vacuum tube projects use potentially lethal voltages that can kill you so do not attempt them if you are not familiar with high voltage safety! Some of the projects use low voltage and if you are new to tubes and high voltage safety you should So, I think its safe to say that on my 4 x 6L6 amp, using the Fender standard 1. Jan 15, 2025 · I am starting to collect parts for a 6l6 pp amp build. The 6146B is another totally different animal redesigned for a grunt more plate dissapation and AB1 SSB leanyour service. All tubes are tested and guaranteed. Common Types and their rating There has been many 6L6 variations, but the most common ones today are: 6L6GC - 30W version. The transmitter was originally a copy of a design found in the 1967 book easy-to-build Ham Radio Projects by Charles Caringella, W6NJV (original schematic). Never touch the amplifier chassis with one hand while probing with the other hand because a lethal shock can run between your arms Jan 15, 2019 · The document discusses the 807 vacuum tube, which was widely used in audio and radio frequency power amplifiers. Bias current is the amount of electrons flowing from the cathode to the plate with no audio signal on the control grid (idle current). If you can do toner transfer PCB fabrication you could do this PCB. This amplifier is the result. This is especially true when pushed to overdrive. What do you do when you need to impedance match the output of a non-linear (power) amplifier though? From what I understand, S-parameters go out the window, because they make the assumption of linearity. These can be purchased rather cheap on ebay and make a nice sounding amplifier. The 6L6 revolutionized power tube design by forming the electrons into beams and using aligned control and screen grids to limit grid and screen currents. Now this amazing amplifier is available worldwide! With Fryette Power Amplifiers, it’s all about the feel. Guitarists specializing Most amps need bias set after you swap power tubes and that requires a special equipment to measure the tube voltage and current and a regular amp player should never open a tube amp and play with the internals (i'm not talking swapping tubes, I'm talking the real internals) as that contain lethal voltages. Apr 4, 2023 · If that is a misunderstanding on my end and the EL34 datasheet does really only describe AB1 operation, it would seem the tubes in common use in guitar amplifiers that can be run AB2 would be 6L6 and derivatives like KT66. Building, troubleshooting and testing of these amplifiers should only be performed by someone who is thoroughly familiar with the safety precautions around high voltages. If your amplifier calls for this tube, you probably CANNOT use some of the earlier 6L6 tubes as they are not rated this high. The 6L6 vacuum tube or thermionic valve was one of the most iconic valves ever produced. 15-0-3. 5K range. I'm thinking something with a minimum power rating of 20 watts so something in the push-pull camp using 6SN7s and 6L6/5881 only because I have a good inventory of each. Download. What is Bias? Bias voltage is the voltage difference between a tube's cathode and control grid. On the other hand, one RCA design (mi9377) sports 47k grid stoppers on a 4x 6L6-G design (lower voltages). The 6BG6G is an early TV sweep tube, and the 807 is a transmitting beam Buy Mullard 6L6GC vacuum power tubes online, in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. I wanted a radio more stable and “user friendly” than a basic Hartley Oscillator, but I knew that building a VFO would Mar 14, 2001 · Push-Pull Outputs. If you’re looking for that classic American tone, then the 6L6 is the tube for you. The circuit shown here is a variation of Gary's circuit, with a "Tuned Stage" which allows for VFO operation. Nov 24, 2020 · Hello to all reading this, I would like some guidance on the design decisions that follow in my 6l6 amplifier build: Two years ago I decided that I would like to build two Monoblock 6l6 based amplifiers. A development of the 6L6 was the 807 - a valve that took the basic 6L6 design, but used a top cap connection for the anode to enable Oct 25, 2015 · It gained popularity back in the 1990s to keep build costs down when used as first stage preamplifiers of power amplifiers that use power output tubes that dates back from the 1930s – like the 6L6 beam power tetrode – which was first manufactured back in 1936. Secure site and online ordering. Meanwhile, you'd be adding power compression when you crank up the amp. This is followed by "the famous G2MA linear amplifier" which uses a thermionic diode to rectify RF grid voltage to control a 6Y6 clamp tube on the screen of an 813 Oct 11, 2013 · This is the place to post known good spice models, and links to libraries, and/or library files. Power input to the amplifier is expressed by the formula: Power In Watts - Eþlp Eb is the amplifier plate voltage and Ip is the amplifier plate current in amperes. I'm sure that The 6AG7 / 6L6 CW transmitter is a result of much help and encouragement from the Glow Bug Net. Main Tx is 160w with 300-0-300vAC above 18mA, 3. He is a senior mechanical engineering student. However, Bartel noted that an amplifier's output stage – and specifically its power tubes – have a dramatic effect on the harmonic content it lends to the sound. We dive into EL34, EL84, and 6L6 tubes and find out the differences. Four line inputs, with source selector. Here is my new 6L6 AM and CW station. They are able to produce a super wide spectrum of tones, from clean and shimmering highs, through to rich and full lows, all while maintaining superb clarity and that characteristic warmth – even at high volumes. It is still in use in audio applications, especially electric guitar amplifiers. base is biased from the high voltage supply and is fed by the phase inverter. Looking for input on experiences with current production tubes ( for cost reasons. Ah yes, electronic circuits. RCA 1941 AN-117 Design Precautions for Oscillators Employing Filament-Type Tubes - Most battery radios are powered-off by disconnecting only the A voltage (filament voltage). Apr 17, 2012 · It all started with a request of mine posted on a "New 183 build" thread: Hi everyone, Sorry for the trivial question but to use 4 x 6V6 as power tubes instead of 4 x 6L6 as well as the different output transformer which other components will I have to change to exploit the tubes in the best way? a Hug, Franco Dorrisant's answer was:The power transformer, power tubes input grid resistors and Practical Amplifier Diagrams (5MB PDF file) page 21 of book (page 49 of PDF) is an all-6N7 power amp with enough gain for guitar. Power and modulator. The tube can stop the flow completely (called cutoff) or let it flow at maximum (called Apr 24, 2014 · For sale: my latest Magnavox custom-converted 6L6 PP stereo integrated amplifier. com has thousands of new and NOS vacuum tubes for the audiophile, guitar amps, industrial RF heating sealing, ham radio and special purpose. Puts out about 20w/ch into 8 ohms, and probably closer to 25w/ch into 4 ohms. Now it really depends on the amp when you are talking about plate voltages. This is followed by "the famous G2MA linear amplifier" which uses a thermionic diode to rectify RF grid voltage to control a 6Y6 clamp tube on the screen of an 813 The 1614 is basically a selected 6L6 intended for class-C RF amplifier use. Is anyone familiar with the 6L6 amp offered by lowther. As we require half the audio power output that we have RF power input, the audio requirements under the operating conditions stated above Will be: . The 6L6GB, 6L6GC, and 5881 will work in any amplifier that calls for a 6L6 type tube. The Best 6L6 / 6L6GC / 5881 Power Tubes - Reviews and Guide Are you looking for the very best 6L6 power tubes for your vacuum tube amplifier? This is the place to start. Check out the following 6L6 tube reviews for guidance on getting the best tone out of your tube amp. So, use KT66's ONLY in amplifiers designed to use this tube. problem is this: the amp sounds fine with at lower volumes, but once it gets loud enough, the output tubes rapidly increase (negatively) in bias, they go into cutoff. The rf choke RFC1 places the 6L6 cathode between the crystal's rf poles, and C1a and C1b together in parallel as C1 adjust the Colpitts feedback by controlling exactly where between the crystal's rf poles the cathode sits. Your Weekend Project. I want to match RF power amp to aerial. Sep 30, 2024 · An original transmitter from the July 1946 QST1 - 4 of 4 1 The 6L6 is a popular power tube, found often in American-designed guitar amplifiers. There are several different 6L6 power tube types and it can get a little Sep 4, 2019 · My son wants to build his first vacuum tube amp. When you replace your 6L6, you should make sure that you replace with the right type. On page 154 in the Linear Amp chapter, there is "A Class C Linear R-F Amplifier," a grid-driven 813 amp with a 6L6 screen clamp tube controlled by the grid-leak bias of the 813. 5k grid and 470 ohm screen resistors is the way to go. Its CCS and ICAS ratings are based around this type of usage, hence its different-than-expected ratings. In a sense, the difference between a 6L6 and a 1614 is in the ratings, not the tube itself. May 15, 2006 · WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES. Plate voltage is 240 volts and I will use a solid state audio amp to drive an audio output transformer in the heising circuit. The plate to plate resistance is only 5K, so a wide variety of OPT's can be used. The circuit was supplied by Lester Earnshaw ZL1AAX. 3vAC and 5vAC all above 3A secondaries, and a pair of suitable output transformers in the 3. Ships with Electro Harmonix 6L6GC power tubes. Page: 5 Pages. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands 807 tube pinout diagram The 807 is a beam tetrode vacuum tube, widely used in audio- and radio-frequency power amplifier applications. The diagram sa 6L6GC, 6L6GB/5881 and KT66 Tubes Different Power Ratings While all 6L6 types are pin compatible with one another, some amps are designed only for the higher powered 6L6GC. Here are the specs: Power: 8W + 8W Freq: 20Hz-35Khz Pure Class A, Single Ended Amplifier Self-biasing, no bias adjustment is needed Tube My first HF rig was a Drake TR-3 lent to me by a local radio club. There is no 50 ohm or 75 ohm transmission line inbetween. The 6L6 “Spalted Alder” Amp An Outgrowth of Optimization This amplifier was a direct outgrowth of the 6L6 Optimization Study. Ignore the "6V power" (unless you have a 1942 Plymouth) and build conventional power supply. Tube Bias Online CalculatorWARNING: A tube amplifier chassis contains lethal high voltage even when unplugged --sometimes over 700 volts AC and 500 volts DC. So, I consider my aim to be matching certain load-reflection coefficient (Γload) to a short circu If the amp was designed for 6L6's then the current is not an issue. ymksq ykjnc ooz biwe lolbro qduofdm qoruv kgg jgdn cvrlzr yit hmisn tijsmknu wdlgb thxm