snubber caps ?

[Valvehead]

See schematic --- What are these 100pf for ? high freq oscillation ?? Can they be removed or bypassed ? Would they affect tone at all ? this is a Peavey 5150

[Enzo]

Not sure why you'd want to remove them. All the tone in this amp comes from the preamp, the power amp is very neutral. But you could take them out, I doubt they affect the shriek in the amp much. They are there for stability.

[J M Fahey]

That.
I would not touch them.
You will not change tone but maybe end with oscillation.
Peavey guys are no fools, they won´t add anything unneeded or out of fancy.