PAB "lite" & revised

[10thTx]

My amp is not a Dumble clone. So, this idea may not work for others? However, I thought I would share it in the spirit of trying to "give back" some help. Perhaps the idea will be useful to someone?

I've built a number of D-inspired amps with PAB and then found myself almost never using it. The reason I didn't use it is because it typically had too much of a volume boost and it seemed
to add too much treble, grit and harshness to the overdrive.

So, I've wanted something that would tonally be more akin to something like a Timmy boost set reasonably clean. Something that preserved the "original" tone but did boost the volume
and gave it a slight push to sustain more. The tone hardly changes at all based on how I typically have treble, bass and mid set.

This is my solution that works well for my amp. I might add that compared to the original PAB (which I tried first), it has VERY little increase in floor noise even though it has a significant increase in volume.

The amp is a D-763 which borrowed some ideas from Dumble and inserted them into a "sort of" AB763 topology but that is cathode biased. Reverb but no tremolo. I'd be happy to share the schematic IF anyone is interested in my posting it?

With respect, 10thtx

[shane]

Well I for one would be delighted to see it

[xtian]

Just put a 1M trimmer between PAB and ground. Then you’ve got an adjustable boost.

[10thTx]

Here's the entire schematic. This is the first time I've really gotten along well with a preamp boost. This preserves the tone I want and removes the harshness.

with respect, 10thtx