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It works for me, has worked for others. But why Marshall??? :shock:

My amp has a non-switchable loop, so I used the old a/b box trick. The a/b box is connected to the preamp and the amp. The pre-amp signal goes into the amp's fx-return. A dummy plug goes into the amp's fx-send so that the Fx-level can be used to set the level between the two signals.

It means the amp is very responsive to your picking. The peaks in the sound will dynamically get more amplification than the softer parts. This amp is a variation on a class ab amp. I read somewhere that it is "plain class ab1" but I don't know what that exactly means. Try googling for "class...

I read somewhere that the "dynawatt patent (Pat# 4,713,624.) is a special way of running an amp in class AB1 mode. From the ax84.com forum: "If they're running hard into AB territory, they can easily get more than 18W. If they're running high voltage and hot bias, on tubes that will take it...

Thanks. Andy sent me his instructions, but any additional info is welcome. Somebody told me he had experimented with several parts on different locations, and that the 1M resistor was the most important thing to change. He also told that a .69 uF capacitor seemed to work better with his...

I'm really interested in modding my formula pre. Do you have soundclips?

Did you do the "Andrew " mod?