I think you need more than a manual and bias settings. Good luck, and I hope that UPS comes through for you.
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You've got high voltages present in tube amps. If you're not familiar with safety procedures at higher voltages you should stay out. These could have enough voltage in the caps right now to give you a pretty good jolt even though you may not have plugged it in. I'm not trying to scare you but don't just poke around if you're not familiar- 300 Volts would not be unusual in a tube amp. If that doesn't convince you, try licking a 9v battery- then multiply that feeling by at least 30x.