Thursday, 7 September 2017

T-Rex Gristle King

Original FSB thread and schematic available here.


11 comments:

  1. Alex, possible to get a switch lug diagram on this? Thanks!

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    1. Hi Paul!
      They are always the same:

      3PDT
      1 4 7
      2 5 8
      3 6 9

      DPDT
      1 4
      2 5
      3 6

      SPDT
      1
      2
      3

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  2. Great job Alex! Another for the build list.

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  3. YES! Thank you for this. The band I'm a part of, our guitarist has this pedal. Loves it.

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  4. Call it verified! Great pedal and sounds almost identical to the YT vid. Used J202 for Q3 after testing a few and it sounded best. 2N3904s for Q1-2, NE5532 for IC and 1N270s for germs. Thanks Alex!

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  5. Hi Alex, I'm new to the board, looks like some brilliant work going on here! I think I have to have a go at the Gristle King. It looks fairly challenging but well worth it if I can make a decent job of it. Sorry if this is a dumb question, but is that a 50k trim pot at the top right & if so what is it doing? I didn't see it in the originally traced schematic over on FSB.
    Thanks!
    Tim.

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    Replies
    1. Welcome to the community :)
      That replaces the fixed drain resistor (R20 on the FSB schematic) to be able to adjust the JFET's BIAS.

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  6. I see, in place of the 9k09 fixed resistor... understood, I should probably have been able to figure that out, but thanks so much for helping (and for the welcome!).
    Now to start putting it together...
    Tim

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  7. What type of germanium diodes are used? Pics i've seen of this pedal show glass diodes with a green stripe. Does anyone know which kind was used? I don't mind buying NOS.

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