Home GuitarPCB Forum General DIY Pedal Discussion Bypassing the stock tone controls on super drive 70’s with Tone TwEQ’s

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  • #19431
    Miah
    Participant

    I saw another post where the builder was inserting a Tone TwEQ between the stages of a Super Drive 70’s, I’m wondering, is it possible to bypass the tone knob of those circuits and use Tone TwEQ’s instead on both stage 1 and 2? (the drive and the Fuzz stages)

    #19440
    wilkie1
    Moderator

    The short answer is “YES!”

    #19441
    fig
    Participant

    Would it be?

    R7 -> IN Tone Tweq1 OUT -> R8 (bypass C4)

    R22 -> IN Tone Tweq2 OUT -> Vol2 P1 (bypass C12)

    You’d also want to bypass Volume on those.

    #19442
    Miah
    Participant

    Bypass the volume on the tone TwEQ’s you mean? I guess that would make sense.

    And do you mean that going from R7->In Tone TwEQ 1 Out->R8 IS bypassing C4 or would there be something else required to bypass C4? And likewise C12?

    Looking at the schematic I think that’s what you’re saying, that the connection points would be bypassing C4 and C12. I’m just verifying to make sure I’m not reading the diagram wrong.

    #19443
    fig
    Participant

    You’re following my thinking correctly, but I am not certain that I am correct. It’s probably best to let someone verify it, or banish me for spouting such nonsense. If those are indeed tone caps, then replacing them in the signal path with the EQ circuits seems logical.

     

    #19447
    Miah
    Participant

    Ah, well it seems logical to me as well, Can anybody verify? also, can anyone speak to how to bypass the Volume on the Tone TwEq’s or are they necessary to stay in the circuit in order for the EQ to work?

    #19454
    Cybercow
    Moderator

    The Volume control on the Tone TwEQ does NOT need to be used. If you come right off of C7, the signal can be passed (at full strength) to whatever is next in the desired signal path.If you still want some control of the Tone TwEQ volume, insert a trimpot in place of the Volume control on the Tone TwEQ and take the out-going signal from the Tone TwEQ’s “OUT” pad. With the trimpot, you can set it and forget it.

    However, a single Tone TwEQ cannot be used individually on two of the different sections of the Super 70’s PCB. So you will need to pick one of the circuits on the Super 70’s board to use the Tone TwEQ in. If you put the Tone TwEQ after the Fuzz section, it will affect both the OD and the Fuzz. That is, if that’s order you’re connecting them.

    To be sure, let us know what order you are connecting all three circuits of the Super 70’s board. Then we can pinpoint specific points to inject the Tone TwEQ.

    #19457
    Miah
    Participant

    I was actually thinking about putting 2 tone TwEQ’s in, one for each section.

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