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tube amp schematic

Discussion in 'Electronic Design' started by Sampei, May 21, 2005.

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  1. Sampei

    Sampei Guest

    I found a sylavania 6AQ5A tube and i want to build a tube guitar amp
    with this electronic tube.Anyone has a link or a schematic?
    Thanks in advance
  2. BobG

    BobG Guest has books with tube amp schematics.
  3. Use any old DSP and a 6AQ5A distortion algorithm.

    Many thanks,

    Don Lancaster
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    voice: (928)428-4073 email:

    Please visit my GURU's LAIR web site at
  4. Pooh Bear

    Pooh Bear Guest

    Does the 6AQ5A have ' magic sound ' ?

  5. Rich Grise

    Rich Grise Guest

    An amp? With _one_ _6AQ5A_?

    Might as well plug high-impedance phones right into the guitar jack.

    Good Luck!
  6. DaveM

    DaveM Guest

    Here are a few web sites that should get you going.. More info than you can
    consume in a day, for sure.
    Knock yerself out!!!

    If none of those sites give you what you want, just Google for "guitar amp
    schematics" and see how many you come up with.

    Dave M
    MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
    the address)

    Never take a laxative and a sleeping pill at the same time!!
  7. Joerg

    Joerg Guest

    Hello Don,
    Can also be done with a CD4007. But then again, a 6AQ5 gloweth so
    nicely. A DSP lacks that retro feel.

    Regards, Joerg
  8. Joerg

    Joerg Guest

    Hello Sampei,

    If you can't find much on the web there are still several options:

    a. Obtain a really old ARRL Handbook, at least 30 years old. Lots of
    tube amp schematics in those.

    b. Look at the schematics of the Drake TR-4 ham radio transceiver. It
    used to be very widespread in the 70's and used a 6AQ5 for the receiver

    c. I believe the Gibson Skylark tube guitar amps also used it.

    d. If you find a large public library somewhere that doesn't throw out
    older books they might have something, too. Probably only in big cities.

    Regards, Joerg
  9. Bob Eldred

    Bob Eldred Guest

    A single 6AQ5 is not a suitible choice for a guitar amp. Two 6AQ5's in push
    pull can be used to make a class AB1 amp of about 10 Watts power output.
    This is quite feeble for a guitar amp. Of course you will need an
    appropriate output transformer and a power supply giving 250 Volts at 70mA.
    Furthermore you'll have to get the tubes and parts for the front end and
    phase splitter, 12AX7 and 12AU7 or something similar.

    If you are serious about it, consider two EL34' tubes for the output stage
    and don't screw around with 6AQ5's. The amount of work is nearly the same
    and when you are through you'll have a much better amp.
  10. Joerg

    Joerg Guest

    Hello Bob,
    Or if you are really serious about it, take even bigger tubes. One amp I
    built had an array of PL519, probably the equivalents to the 6KD6. That
    amp produces a lot of oomph. One twang on the guitar and the rafters shook.

    Regards, Joerg
  11. BobG

    BobG Guest

    Maybe just make a preamp. How much plate voltage to get the thing to
    work? 100V?
  12. Rich Grise

    Rich Grise Guest

    You can get transconductance at amazingly low plate voltages. I saw an
    article in QST or something, 30 or 40 years ago, that had a QRP receiver
    with 12 V. on the plates. 12AX7, I think.

    But was the guy's question, "How do I build a TOOB amp" or "I found this
    TOOB - how can I use it?"

    I say, mount it on a minibox, and drive the filament with a 6V lantern
    battery in series with the speaker output from a real amp. Set it on
    top of your stack - It'll look KEWL! %-}

  13. Ken Smith

    Ken Smith Guest

    Drinking glasses + red LEDs + DSP
  14. Robert Baer

    Robert Baer Guest

    Near 3W or more, it does...
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