Well, I’m now 2 for 2 … at having no guitar sound after all the power things test out fine. Guess I get to learn more about amp troubleshooting. I doubt it’s a pre-amp tube, but just in case I guess I’ll switch them out. The only sound I get is when I tap my multi-meter (checking DC voltages) on the terminals on the three caps closest to the tubes … from V3, the phase inverter. Oh, and when I switch the NFB switch. Everything else is silent. No amp hiss in the speaker or anything. I’m guessing maybe there’s either something not connected or I’ve got a short in the preamp circuits.