Hi, just asking the feasibility of the following amp. A fellow senior at my school just finished building a PIMPING guitar (maybe he'll send me a pic or two) and would like a pretty solid tube amp to accompany it. His preliminary idea was around 75 watts, with some basic controls such as overdrive, bass and treble. Here are my thoughts. I'm an amateur at guitar amps, so let me know if something is absolutely infeasible.
Output tubes - 2 KT88's. At guitar frequencies, 75 watts should be possible, right? I might use a single SS diode to tap off a negative bias.
Driving tubes - 2 12AX7's, 1 12AT7. The 12AX7's serve to jack up the gain, and at least one triode will feed a filter network. I have Duncan Amps' Tonestack Calculator and TubeCAD, and I have basic biasing knowledge. Each half of the 12AT7 will drive a KT88. The OPT would be one of Edcor's 5K 100W deals.
PSU: I'm thinking a 282X (200mA 1000VCT) feeding a 5U4, into a small filter cap, then a 193H choke (5H 200mA 65R) and a decent filter cap. RC's to feed the 12AT7 and 12AX7.
This is a pretty sketchy layout but does it seem feasible? His budget is around $600. Nothing amazing for the tubes, probably Sovtek. Does anyone happen to have a schematic lying around that looks like it could work? Thanks!