Peavey ValveKing 100 Overhaul

[physics]

Greetings

You may wish to refer to the Tube Tone chapter in TU5 as the plate time constants are effected by the internal resistance of the valve. The low-frequency roll-off is actually lower than the visible components suggest, although, as KOC states, one can use the circuit values around the valve to gain insight to the relative filter effects as you are doing.

Cheerio

Thanks for mentioning that. I am aware of that and will be double checking things later to make sure I correctly understand and calculate what's happening, but for now the attenuators are what stick out to me as plausible causes for stuff I don't like. Plus at the moment I'm trying to figure out what's thinning out the sound (harmonically and otherwise) so if the roll-off is lower than I calculated than that's not really a problem for me yet. The amp is a bit too bassy/loose for my taste though, so I'll probably come back and revisit the coupling caps later. Another suspect on my list is what looks like a feedback loop around stages 2 and 3. I'm wondering if it might currently be linearizing things too much for my taste. Of course I haven't thoroughly evaluated it yet to see if it's doing something important, right now it's just a hunch that I should examine it a bit closer at some point.

Thanks for the input!