When you have completed the wiring, don't plug the amp in. You are not ready for the smoke test yet. There are still some things to do.
a) ensure a speaker (of the proper impedance) is available to "load" the amp. Energizing an unloaded amp could result in damage to components like the output transformer and power amp tubes.
b) verify the circuitry against both the schematic and layout drawings. I found it beneficial to highlight each component and lead on both drawings as I verified them. Take your time here to ensure accuracy.
c) verify the circuitry against both the schematic and layout drawings. It is not a mistake that this step appears twice.
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