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need help installing PPIMV

Discussion in 'Shock Brother's DIY Amps' started by Stan Martin, Aug 26, 2010.

  1. Stan Martin

    Stan Martin Tele-Afflicted Silver Supporter

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    to an 18 watt Marshall clone. schems/diagram would be great
     
  2. laird

    laird Tele-Holic

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  3. SnorkelMonkey

    SnorkelMonkey Tele-Holic

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    The problem with using those values is the max grid leak resistance is around 407k. 18 Watters use 470k for their characteristic EL84 output drive. There's also a sweet spot around 415-430k that you'd be missing using these values. A better choice (and more common) is the 1M pot in parallel with 1M resistor shown below. At max it should read ≈500k.

    [​IMG]
     
  4. Ronsonic

    Ronsonic Tele-Afflicted

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    A major advantage of the snorkle monkey circuit, it's fail safe. Even if that pot completely falls apart you don't lose bias.

    This is important in any bias circuit design or mod, it should fail into a safe mode.
     
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