Dave Funk book

[Meat&Beer]

It talks about a "Dumble inspired" mod in the tone stack, the "Deep" switch I think? There's a lot of info in the tone stack mod section, actually. If voicing is what you're looking for.

A little phase inverter stuff, swapping 47k plates to 100k and 82k, etc.

In the quick basic and essential mods section, it is EXTENSIVE talk of different tube types, pre, power, and rectifier types, and modding the amp to accept them.

I'd certainly let you borrow it if you were local?

[martin manning]

It talks about a "Dumble inspired" mod in the tone stack, the "Deep" switch I think?

A Deep switch shows up on the blackface Bassman, but Dumble's is different.

[Structo]

I think I have that book around here somewhere.

I remember when I bought it, it was just before the prices went through the roof!

Now if I could just find it.

[John_P_WI]

I bought it 20 years or so ago... Sorry, I was underwhelmed by it - I do remember the 3 essentials of amp modding mentioned, make it louder, make it brighter, make it louder and brighter.

I guess I need to remember that the book predates the growth of Internet based amp stuff that allows the knowledge to be disseminated so quickly.

As mentioned in this thread several years ago, I'm more geared to the TUT series.