Heater wiring done. Per Merlin Blencowe's recommendations, each heater pin's wiring stays tightly twisted up to the socket, then jumps straight across to the opposite pin on the preamp tubes. This minimizes the chance of the AC heater wiring radiating hum that is picked up in the sensitive signal wiring. Runs between sockets are pushed up into the chassis corners to maximize distance and shielding for those runs. Done right, this all combines to reduce as much heater hum as practical. Takes a couple of hours, and can it really build tension in your neck and shoulders from the tight quarters in a chassis.
Break time!
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