A trio of software programs for the intrepid tubephile. Here youll find a modest collection of some interesting tube amplifier schematics. On that basis, i decided to stick to the single ended amp design shown in the typical application notes. Here is the circuit diagram of the classic 5w tube amplifier with el84 as the final amplification component. Due to popular opinion, im putting in some of these cute triangular symbols. Im going to get myself some nos rca tubes and try those, but perhaps there are substitutions that will allow me to get a clean sound. The term all american five abbreviated aa5 is a colloquial name for mass produced. Those circuits are in the back of the rca tube manual. Dec 18, 2015 i found this schematic when i was pondering over a singleended 50c5 amplifier circuit with a power supply xformer for isolation.
The amplifier stage is based on the compact hifi power amplifier. I currently have a 25 watt 6l6 powered amp, which is too loud when i need to crank up to get some good tone. Diy audio projects forum looking for 50c5 pp amplifier. Soon, you will be able to add your own schematic links online. With only four mini 7 pin tubes, two 50c5 and two 12av6 or 12at6 tubes, this is a very simple single ended amp rated around 1 watt, might be a little lower.
Sep 28, 2010 for a schematic example of this type of amp, see the harmony h400. Because of its size and design, it is most likely in the 510 watt range. Uses all aa5 allamerican five, refers to the dimeadozen line operated table radio tube lineup tubes, in this case a type 35w4 rectifier, 50c5 output, and a 14gt8 or 12ax7 for the driver. In response to numerous requests, north coast music has assembled an. By trying out several different sets of operating conditions in the computer i could eliminate hundreds of possibilities without playing with electricity. The big question, after you unplug your soldering iron, is whether it will sound cool. Dec 03, 2010 he did not use a tube rectifier and managed a cool trick because of it. Feel free to send us your hifi audio schematics and we will add them here. This amplifier was originally featured on the january 2004 issue of the highfidelity audio.
Chosing a replacement output transformer now lets assume we have a set that has an output transformer with an open winding that must be replaced, and the output tube is a single 6f6. You can see what i built roughly based on this at the link in my sig below titled testament mki. Amp schematics, amp schematics, tube amp schematics, valve amp schematics, vacuum tube, audio tube, effect schematics, effect pedal schematics, analog effects, digital effects, guitar amp schematics, bass amp schematics, fender amp schematics, marshall amp schematics, gibson amp schematics, ampeg amp schematics, vox amp schematics, dumble amp schematics, mesa boogie. Schematic heaven amp schematics, tube amp schematics, valve. As this section is responsible for a huge amount of trafic each month ive decided to run a. Since, as a singleended circuit, it had to run in class a operation, it typically dissipated about 5 watts on the plate, 1 watt on the screen, and 7. Pp el34 tube amp schematic by mullard with dynaco a420 ef86, 6cg7 input. Used vintage tube amp in very good working condition. The main thing is, i havent been able to find an output schematic of a 50c5 pushpull pair. I think my next build is going to be one channel of a dominator using 35c5 and 20ez7s and an iso trans, hoping for close to a dom18w that is only 2 watts. This is a fanon fanfare fx2, which i believe was some sort of intercom. Initially had to answer the question classic push pull or a single ended amp. However, arrangements would need to be made for the output tube filament supply, as directline operation would considerably exceed the maximum heatertocathode voltage, and is therefore not recommended.
The biggest difference is the rectifier the schematic is drawn with a solid state diode. Schematic heaven amp schematics, tube amp schematics. Last week i built a 4 tube guitar amp for my son for the heck if it. If you have a link to a schematic which is not listed here, please let us know we will be more than happy to add it. The 50c5 power tube wasnt designed for plate voltages much higher 120v. The main amplifier this is the schematic diagram of the lil 4x4s main amplifier circuitry. The idea of building a diy audio vacuum tube amplifier based on highquality materials begins in the early 90s. Oddblocks 12sl7 srpp kt88 pushpull tube amp schematic. This classa pushpull tube power amplifier uses a pair of pushpull class a, ultra linear mono block tube amplifiers that can be used with several different vacuum tubes including kt77 6l6gc kt88 with a 12sl7 driver and 6no30 tubes. The big problem with those tubes is that they were commonly used in series filament strings designed to work directly off 100 v ac. All american 5 tube radio, 1 50c5 schematic 60k ampex 1470 tape deck power amplifier, 1 6aq5 schematic 51k provided courtesy of steve gates and john warmack. Im looking to make a guitar amp based roughly on the aa5 design. I think the 8w amp will be more useful and more fun than the.
Even if you only own tube gear and have no ambitions at all of tinkering with any construction projects, youll find the tube manual to contain essential knowledge. The veritable 12ax7 was the work horse dual triode pre amp mixerdriver of choice in the 195060s. You can bypass the 150 ohms with about 50ufd 50v for more gain, and you will probably have to. The teacher ran the amp through several tests he said it is one of the best circuits he ever saw it checked out excellent on the scope. The builder is from argentina so he had rolled input tubes of various. Ive been messing with building amps, especially tweakin em and really end up liking split bias even though the fender silverfaces caused it to get a bad. The higher filament voltage is drawing about 7 additional watts. One thing about diy audio is that it is a journey, not a destination, it never ends. Ill be adding more brands and schematics in the near future. You can replace it with an lm380 or 386 with a bit of doing but. As this section is responsible for a huge amount of trafic each month ive decided to run a few ads here to help cover the costs. I fellow radio enthusiast designed it around the radio tubes.
Triplett 3444 and 3444a tube tester instruction manuals with schematics and parts list adobe pdf files triplett 3444 instruction manual schematic. There is also a huge library of effects and solid state schematics. I like these tubes because they can offer a decent sound for their price, but primary because i can get very cheap 230v115v power transformers and so wire their heaters in series, just like the aa5 radios. Now, i do certainly know the rules of these things. Ac wall power from the power cord flows through the onoff ac switch and on to the power transformer shown at bottom center which steps up the wall voltage to 325 volts rms root mean square average ac for the high voltage supply and steps it down to 6. A beat up 50 dollar tube amp of the silvertone or worse variety that you buy and recap, will sound a lot more like a guitar amp, frankly. Despite their best replication efforts, the consensus among performing and studio musicians remains that there is no substitute for a welldesigned tube amp. The heaters of the tubes were connected in series, all consequently drawing the same current, but with. If you need a schematic, and it is not listed above, it means we dont have it and dont have a link to it. Tube amps seem to be a very experiment and listen for yourself field, with everyone giving their. The 12at7 amplifier below is the best that i could do. Amp schematics, amp schematics, tube amp schematics, valve amp schematics, vacuum tube, audio tube, effect schematics, effect pedal schematics, analog effects, digital effects, guitar amp schematics, bass amp schematics, fender amp schematics, marshall amp schematics, gibson amp schematics, ampeg amp schematics, vox amp schematics, dumble amp schematics, mesa boogie amp schematics, gretsch amp.
Tube amp schematics index page there are over 3500 tube amp schematics and other types of schematics in the el34world schematic library. The v5 student amplifier repair schematic thomas organ never produced a repair schematic for the vox v5 student amplifier. The 50c5 is a beam power tube, commonly used as an audio amp. After building my first tube amp from a kit, i decided to embark on a bit of an adventure. I went through every tube in the tube cad library trying to get a voltage gain of 50 and a tube current of close to 10 ma. The 50eh5 pentode has been widely used in many audio applications in past, so there is no need to develop a new design around this tube. Hickok test instruments free manuals, tube data, and schematics. The required parts for this amp can be found in any aa5 tube radio, though the 35c5 tubes were most commonly found in the old 7tube table top amfm sets. I got a little practice amp on ebay that sounds cool but distorts way too early for my taste. There is very little information on these amplifiers, it appears they are quite rare in this condition. The vox showroom vox v5 vox student tube amplifier a. Basic theory using 21stcentury technology to design vacuum tube preamps, power amps, and power supplies. Push pull 6550 monoblocks diy project sarris custom tube amps. The output tube, 50c5, was capable of a maximum power output of 2.
The 385w4 is reasonably easy replace it with a 1n4xx diode. The schematic will sometimes give the dc resistance of the windings but that doesnt help us know what impedance the transformer should be. In this example they used a small transformer for the heater of the 12au6, but the 50c5 and 35w4 heaters have no transformer isolating them from the wall outlet voltage. The heater of the 50c5 output tube was wired to this filament tap in parallel. I found this schematic when i was pondering over a singleended 50c5 amplifier. I built the 8w amp for 1st year college electronic lab class project. Your playing is as a real as it gets, what a treat. Part of diy is that you can do things that manufacturers wont.
Atarashi designed this amplifier for the multichannel sacd application with just fourchannels instead of the normal five. I think it has a bad output trasnformer as well as needing to be recapped. Classa pushpull tube power amplifier electronics diy. In other words, playing a guitar amp without an isolating transformer could be like sticking a fork. Like the aa5 radio, the vox v5 student was capable of 2 to 3 watts rms. Oddblocks power supply schematic part of diy is that you can do things that manufacturers wont. Does anyone remember the old 3 tube amplifier circuit that used a 50c5, 35w4 and. This is a single channel amplifier mono of course with single input and single output. This is our collection of diy and hifi audio schematics. Im hoping to use a pushpull pair of 50c5s, with a 35w4 rectifier, and either a single 12a7 gain stage or a duel 126 gain stage for a relatively lownoise, 25 watt output amp. As mentioned earlier, the schematic makes use of 12av6 mislabeled as 12sq7 and 50c5 tubes. The 50c5 are grey plate the say usa under the 50c5. The tubes are series filament string using 212at6, 1 50c5 and one 50dc4.
I found this schematic when i was pondering over a singleended 50c5 amplifier circuit with a power supply xformer for isolation. Being a guitarist who shares that opinion, i chose to design a tube amp of my own. Its much easier to analyze an amp circuit by studying its schematic. Weber has a nice little el846bq5based simple amp kit they call the smokin joe ii. A power transformerless tube amplifier design that fits in your bag. At the same time i had a few voltage amplifiers breadboarded on the tubelab system for testing. Assembly manual schematic parts list tubes and applications design simulations. You should build the two similar circuit to make it stereo.
So starting the design somewhere in 1994 i decided to design. Nolan lees tube tester page military tube tester data and information. He originally used a 35w4 in place of a 50dc4 with a 75 ohm filament dropping resistor. There is an amp with a builtin speaker and an external speaker. Last year i built a 4 tube guitar amp for my son for the heck if it. For those of you who dont recognize it, this is a thermal relay in an octal socket. Been thinking about building a tube amp for practice session. I do, however, highly recommend building the amp in a different, larger chassis as the stock weber chassis is too small imho. For plan pack, schematic, layout, chassis diagrams visit original circuit all tube amp build. The cathode resistor in a typical triode preamp is bypassed with a large capacitor to eliminate a form of negative. So im going to double check all solder joints and such and then my next move is to put it back together and see if the tubes which are definitely original light up. The allamerican five circuit using miniature tubes the output tube, 50c5, was capable of a maximum power output of 2. What software did you use, and where to get so nice software. System design a professional methodology for crafting a complete guitar amplifier.
A radio with an identical circuit had been blowing up the market. He did not use a tube rectifier and managed a cool trick because of it. Very nice, classic 3 tube, mono, class ab audio amp. Some people dig line voltage amps and say theres a way to use an isolation transformer to make them reasonably safe. The power supply design diagram already provided on above tube amplifier read more. Im pretty sure this circuit was drawn up by joe rosen. Bogen sa1040 intercom, 1 6l6 schematic 100k compactron tv tube single ended amplifier, 1 17bf11 approx 3dbw schematic 75k flashacall 2700 intercom, 1 50l6 schematic 93k. If you have built any of these circuits, we would love to hear from you so send us your comments. A fellow radio enthusiast designed it around cheap radio tubes. Heres a schematic for the amp complements of paul marossys website. Oddblocks 12sl7 srpp kt88 pushpull tube amp schematic 12sl7 kt88 tube amp power supply schematic figure 2. I would like to offer a tube guitar amplifier for a good old friend of mine for his birthday. My only problem is that it only has treble, bass and volume control.
Thats it for the signal path, now lets examine the amps power supply shown at the bottom of the schematic. Why order tubes when you can use up the ones you have laying around. Almost identical circuit to the el84 amp, except output tube is a single ended 6v6gt. The sooner you learn to read amplifier schematics the sooner youll be able to analyze classic amp circuits and learn how the masters of amp design voiced their amps. Knox tremtone model 603, 1965 tube amp grey reverb. Push pull 6550 monoblocks diy project sarris custom tube. For a schematic example of this type of amp, see the harmony h400.