• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

SS diode heatsink requirement

We are in the Tubes section, yes?

IMHO hardly any tube amplifiers need heatsinks on Silicon rectifiers. 1 Amp of B+ current is a BIG tube amp (eight 6550 etc) and that's when I would start to think about sink.