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FedWar, this is true. the "pull gain" was the tone stack lift in the earlier B revisions. To my knowledge, it was changed from the original switched open to one with a resistor to make it less of a gain/volume jump when tapping the foot switch. and then took the later purpose as described. As...

Fred, the .12 is part of the RC network driving the send triode. Leave it unless you are implementing a different loop circuit such as the Mk1 Reissue or Mk2 loops.

Appleridge, As a long time fellow owner of a lat transitional B, I'll offer what observations I can. WARNING Loooong post: thought that some of the technical info might help you get to where you want to go. I'm sure Mike sent along the instruction sheet for the mod, so you know that the dot on...

Fred, It’s easy to make an amp sound bad, much harder to make one sound good… Rather than focus on the math, start by finding an amp you like and understand why it does. Understanding why NFB is used/manipulated is key to knowing what approach gets you what you want. To your earlier...

Fred, Don’t get around much anymore or I would have piped in earlier… Back in the day, Randy toyed with several PI/NFB presence circuits based on either a tweed bassman and Blackface Fender, which is not news of course. During the 70’s Mark 1 run either might show up in any given amp. Looks...

Rob, You are indeed correct. The late IIB has a 9C pre-amp board (your 83 was likely a transitional B, with later style knobs). Contrary to some conventional wisdom, the pull deep function was introduced in the Mark IIB and the 9C board has it; the face plates just continued to say gain boost...