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Generic ext. speaker wiring question

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by YBA-James, Feb 10, 2019.

  1. YBA-James

    YBA-James Member

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    I'm almost embarrassed to ask, but I just can't wrap my head around this one - which is kind of hilarious as I spotted errors in the bias circuit no problem. :D I don't know what it is about switches and jacks...

    The amp is new to me, a mid-late '70s Traynor YGM-3 combo amp. It's in good cosmetic shape but has been hacked up a bit.

    The wiring to the ext. speaker out is all wrong. Nothing goes to the switch lug, so the output jack is basically a terminal as of now.

    Can anyone help, and tell me which wires need to go where? Obviously there's the 2 speakers wires, the 2 OT wires (black and green), and a separate ground and NFB loop wire.

     
  2. Jeff Gehring

    Jeff Gehring Silver Supporting Member

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    Is this the only speaker jack then? Otherwise things appear to be hooked up as they should be: NFB wire, one speaker wire, and the green from the OT secondary going to the tip, and a ground, a speaker wire, and the OT secondary black wire going to the sleeve. As you mentioned, you might expect to see a wire connecting the tip shunt switch to ground, to ground the secondary if no speaker is plugged in...
     
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  3. YBA-James

    YBA-James Member

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    Yes, sorry if I wasn't clear. It's a combo amp with a speaker, and this jack, being the only speaker out, should disable that speaker for use with an external cab. At the moment, it does absolutely nothing.

    Cool little amp though. Has a Revisit replacement reverb tank, and an Eminence Legend speaker. Haven't had the chance to turn it up since I've gone through it. The bias pot was installed in the wrong place, the speaker was nearly falling out, and the reverb tank was not bolted down.

     
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  4. Jeff Gehring

    Jeff Gehring Silver Supporting Member

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    If you want it to work such that the internal speaker is connected when NO plug is plugged into the ext speaker jack, and such that the internal speaker is disconnected when something IS plugged into the ext speaker jack, you could wire it up this way:

    [​IMG]
     
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  5. Steppin' Wolfe

    Steppin' Wolfe Member

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    Hmmm....the schematics don’t show any auxiliary speaker jack of ny kind.
    https://el34world.com/charts/Schematics/files/Traynor/Traynor_guitarmate_ygm3.pdf

    If the green OT secondary wire is connected to the tip lug, then that jack should work as a parallel extension speaker jack as it is wired now, it seems to me. Are you saying that this jack really doesn’t do anything? Have you checked the lug contacts with a meter?
     
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  6. YBA-James

    YBA-James Member

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    Jeff, you're on the money. Thank you!

    This is a later 70s model from what I can tell, and even the schematic printed under the hood isn't quite correct.
    When I plugged my 4x12 into it, the sound continued only in the built in speaker, and not the 4x12. Reading what you're saying makes sense though... It should currently act as a parallel out, right? I did test the lugs but really only checked continuity on the one that isn't used, and manually pressed down the tip to make sure it was still functioning properly.
     

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