Built-in Silvertone Guitar amp circuit questions

Discussion in 'General Electronics Chat' started by thedanimal, Aug 21, 2016.

  1. thedanimal

    Thread Starter New Member

    Sep 19, 2009
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    Hi all,

    I've acquired a 1964 Silvertone guitar with a built-in amp that I'm trying to make functional again. I have the guitar rebuilt, but the amp circuit did not include the 2 9 volt leads to power the amp so I'm trying to identify how to hook up the new leads I bought to test the amp. Here's a pic between the amp on/off switch and the pots. Any help would be greatly appreciated as I'm just now learning about circuits.

    Dan

    Amp power.jpg
     
  2. #12

    Expert

    Nov 30, 2010
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    That picture shows no evidence of an amplifier so it's impossible to see where to connect the battery.
     
  3. thedanimal

    Thread Starter New Member

    Sep 19, 2009
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    Here's the full circuit. The only picture I've seen had the leads attached to the pots and switch.
     
  4. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    It looks like a push-pull amplifier.
    It has two transformers in the amplifier.
    The circuit could be like this :

    amp24.png


    It would be nice to know the part number of the transistors with the tabs on them.
    It is not possible to see where the power connections could have been.
    Is it possible to show a picture of the other side of the amplifier?

    Bertus
     
    Last edited: Aug 21, 2016
  5. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Post deleted
     
    Last edited: Aug 21, 2016
  6. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    I have posted the image from the link to avoid unwanted images in the adds.
    (I am using add block plus to avoid unwanted adds and save bandwidth).

    Bertus
     
  7. absf

    Senior Member

    Dec 29, 2010
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    My guess is those transistors are PNP Germanium from the 60s'. They are probably made by Matsushita or Toshiba.

    Silv full circuit.jpg
    Allen
     
  8. thedanimal

    Thread Starter New Member

    Sep 19, 2009
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  9. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    I have made some remarks on the circuit drawing:

    1487_circuit_board_connection.jpg

    The power switch can be mounted in the - line of the battery.

    Bertus
     
  10. thedanimal

    Thread Starter New Member

    Sep 19, 2009
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    Hi Bertus
     
  11. thedanimal

    Thread Starter New Member

    Sep 19, 2009
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    Hi Bertus. Thank you for your thoughtful response. I must concede that I am just getting started with electronic circuits and am early into books from Mims and Platt to learn more.That said, I'm not following your notes for how to hook up the leads. If you can please be painfully specific via point-to-point wiring from my original image I'd be very grateful.

    Regards,
    Dan
     
  12. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    A direct, high resolution close up image of the circuit from above and from below would be very useful in helping you out with that.
     
  13. thedanimal

    Thread Starter New Member

    Sep 19, 2009
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    Thanks...I will work on getting this updated very soon.

    Dan
     
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