PR- too much verb!

Discussion in 'Shock Brother's DIY Amps' started by Uncle Daddy, May 11, 2021.

  1. Uncle Daddy

    Uncle Daddy Tele-Afflicted

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    My latest PR build has way more reverb than is useful, and I'd like to try to throttle it back somewhat. I've got a 100k log pot on the way to alter the sweep, but I'm thinking that upping the 470k return resistor to say, 1M will give me what I'm looking for.

    Any pros or cons?

    reverb.JPG
     
  2. hamerfan

    hamerfan Tele-Meister

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    Try a 12au7 tube.
     
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  3. Jowes_84

    Jowes_84 Tele-Meister

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    You can go up to 1,5meg (which is actually what one of the reissues has, I guess the 68 custom) and even reduce the pot to a 50k if it’s still too much.

    EDIT: it’s the 68 DRRI That has the 1.5meg - not the PRRI
     
  4. Uncle Daddy

    Uncle Daddy Tele-Afflicted

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    So I tried the 1M and it works well. It was way too splashy before, with almost no control over the sweep. Now it works much better, with the abbey sound at the end of the dial rather than in the middle. The decay is a little long, but I'll leave things as they are for now.
     
  5. tele_savales

    tele_savales Tele-Afflicted Platinum Supporter

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    A dwell pot can be pretty useful.
     
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  6. ArcticWhite

    ArcticWhite Tele-Afflicted

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    Did you try the 12AU7 tube?
    It gives way more control on the reverb dial. Before I swapped mine, the reverb was max surf at 3 and just about useless above that.
    With the 12AU7, you get a much more usable range.
     
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  7. Jowes_84

    Jowes_84 Tele-Meister

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    Yes but I prefer having the AT7 in there. I don’t own a PR(RI) but messed around with similar Fender circuits and found a bigger reverb mix helps. Plus some of the reissues use it too (I think 68 customs)
     
  8. 5F6Animal

    5F6Animal Tele-Meister

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  9. King Fan

    King Fan Poster Extraordinaire Ad Free Member

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    So can I ask what it is you like better about the AT7? Nothing against changing the resistor, just curious.
     
  10. Jowes_84

    Jowes_84 Tele-Meister

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    there are always pros and cons

    pro AU7
    it is easy and non-invasive
    does the job

    pro 1meg R
    I can leave the AT7 in that circuit where it was meant to be and for which the cathode resistor was chosen
    does the job

    the latter makes more sense to me but an AU7 probably also works... if I ever get to have a PR(RI) I will try that first
    my experimentation was mainly with later SF Twin Reverb and Rivera-Circuits
     
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  11. Jowes_84

    Jowes_84 Tele-Meister

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    plus - I might be wrong ;)
     
  12. zook

    zook Friend of Leo's

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    Change the reverb driver grid leak resistor from 1 Meg to 470K,
     
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