filthy dirty Peavey Classic VTX hybrid amp just handed to me, how do they sound?

[Jazz P Bass]

As it is possible to do the mod, there are going to be a few issues.

Where the OP calls for adding two 1N4148 diodes in series with CR3,(see edit note) on the VTX that will be CR4.(see edit note)
Solder them in series up & off of the board.

It appears that Peavey was trying something, as the Bandit 65 & the VTX, while being identical on the top half of the feedback loop, are markedly different on the output half.

The Bandit mod has another 1N4148 added in series to CR5. No biggy. Bring one end of each diode up off of the board & tie them in series.

Now the VTX already has two diodes each & they are tied together in the middle.
So one of the diodes, CR5 or CR7 has to be removed.
Additionally, the existing diode has to jump across that 'tied together' trace.

EDIT: It appears that the OP had his labels wrong.
According to his attached layout, the top half diode to change is CR4.
On the VTX, that will be CR3.
(which makes more sense , if asymmetrical clipping is the desired outcome.)

[nashvillebill]

I believe this was Peavey's "Saturation" design as described in their patent:

[Silvertone Jockey]

Now I have no choice but to dig out my O scope and signal generator. I was changing the OP amps and I accidentally plugged one in with all the legs on one side outside the socket. End result? Dead amp. Figured OK plug it in correctly should fire up.....Nope

Plugged in the original OP amps....nothing. Checked all the obvious stuff, pulled the board out to inspect the solder joints, reassembled....still DOA. Tried swapping out the OP's one by one.....nothing. Could I have fried one or more of those FET's?

[Silvertone Jockey]

I've repaired the amp by ordering new OP amps. Replaced all of the 4558's with KIA4558. Next step is to implement some of the iep mods from Slo's Bandit thread