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6SN7 Push Pull Output?

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  • 6SN7 Push Pull Output?

    I have whats left of an old Webcor wire recorder that I used
    as a guitar amp. back in the very early 70's. It had a 6SN7
    output and 5Y3 rectifier, don't remember what the other
    tubes were. Anyhow for some reason I started stripping
    it down (about 1972) and forgot about it. Lost the power
    transformer, but still have the output. I would like to
    build something out of it, I thought it had a good sound
    but I was 16 at the time.
    I had the schematic back then but that was long ago.
    Any ideas?

    Edit:
    Cleaned up chassis and found tube sockets marked.
    It had 1 6x5, 1 6v6, 1 6sn7, 2 6sc7.
    Last edited by LEAKYCAP; 01-05-2009, 02:50 AM. Reason: New information

  • #2
    Probably the best thing to do to start with is to trace out a schematic. Start with the power supply and follow it from the primary side to the secondary and all the way out to the last node for the preamp. Then start with the inputs and trace out the signal path all the way thru to the output.

    Once you get that done you'll have a pretty good understanding of how the amp is peiced together and what makes it work. It may seem like too much of a bother, but it is well worth the effort in my opinion. Besides, you really will need a schematic to do any work on it, and this is probably the only way you'll get one.

    Once you've got the schematic drawn out you'll probably want to change out the old filter caps and any other electrolytic caps, and replace the old two wire cord with a three wire cord w/ safety ground; unless those things have already been done.

    Also, check resistors for drift and replace those that are significantly out of spec. Clean up the jacks and pots. You can probably use a Hammond power transformer, check tubesandmore.com The P-T269JX will probably work OK, check that the mounting will work on your chassis.

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    • #3
      Thanks, that Hammond transformer for about $40 would be about right. I'll keep
      looking for the original one for now, and start drawing a schematic.

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      • #4
        I found a schematic at this site:

        http://www.webster-chicago.com/288.htm

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