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Friday, November 4, 2016

Earthquaker Devices Tone Reaper

Happy Fuzz Friday, everyone! This week I give you the Earthquaker Devices Tone Reaper. This got traced over the Tagboard Effects forum, so thanks to Galapagos for doing the leg work. It's based on the 3-knob Tone Bender, with the darlington pair of germanium transistors simplified into a single high gain silicon transistor. In some respects it's similar to the D*A*M GB-83 Greasebox in that respect. An AC176 is used in the originals but others may work. Socket and experiment as usual. The tone control has also been changed to a BMP tone stack. I redrew the schematic for reference:




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13 comments:

  1. leddreamzeppelinNovember 7, 2016 at 4:32 AM

    Tried some old soviet germanium transistors - sounds good. Interesting fuzz. Are there any recommendations as for transistors hfe?

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    Replies
    1. Effects LayoutsNovember 7, 2016 at 7:35 AM

      I'd use something in the 100-120 hfe range for the germanium.

      Delete
  2. leddreamzeppelinNovember 7, 2016 at 4:36 AM

    And one more request - could you make a layout of DB1 here's the link https://guitar-gear.ru/forum/index.php?app=core&module=attach&section=attach&attach_id=7280

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    Replies
    1. plushNovember 7, 2016 at 9:00 AM

      Dude, your link already has a layout in it :D

      Delete
    2. leddreamzeppelinNovember 7, 2016 at 9:16 AM

      Yep, it's got PCB layout. I don't have an opportunity to make a PCB unfortunately

      Delete
    3. plushNovember 8, 2016 at 7:45 AM

      You can easily transfer this pcb layout to perfboard since it has pretty standard spacings
      ;)

      Delete
  3. T-FunkJuly 1, 2017 at 1:21 AM

    Populating this board now, I think the pot labels for the level may be flipped?

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    Replies
    1. Effects LayoutsJuly 1, 2017 at 8:01 AM

      Yeah you're right. Just a little typo on my end.

      Delete
  4. Pedro PinheiroMay 15, 2018 at 3:52 PM

    Do you know any silicon transistors that cpuld replace the ac176

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    Replies
    1. Effects LayoutsMay 15, 2018 at 4:00 PM

      Something around 100-150 hfe like a 2N2369 could work, but it would sound different. And Russian germaniums like the MP38 are generally easier to get.

      Delete
    2. Pedro PinheiroMay 15, 2018 at 8:28 PM

      Thanks, I think I will have to do some breadboard versions before building it on an actual pcb

      Delete
  5. Alexandre IjuimNovember 11, 2020 at 2:39 PM

    I used the germanium 2SD30 by sanyo, and it works perfectly.

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  6. Lorenzo T.November 29, 2020 at 2:24 AM

    I used MP38, sound great but the pedal act like a limiter when I stroke harder the guitar strings. Any suggestions about this behaviour?

    ReplyDelete