Can be calculated from Vout pin - Vh but that's including cable voltage drop. Anyway what you aim at is correct Vh.
You may find closest Vref match between your LM317s if to keep measured resistors exactly the same value between dual heater psus or you will match tolerances between LM317 sample and Rset. If you care to have close Vh between certain tubes which is not very necessary.
During this time you don't have the power amp on because the 6V6 stage is stabilizing. And you turn off the power amp first during system shut down. Alternatively you use 1 minute or more on time delay / fast off 6V6 line signal output relay system.
I always power the system starting first the source & final the power amp and turn off inversely.
I don't have my schematic. Must design if I ever need. Simplest would be copy from dcg3 and make big value R for RC. I just power on & off in the sequence you described. There are 555 chip based solutions with variable timing etc. Just Google and you will find.
It seems isn't enough with 3R3 paralleled with 16R, I have to reduce still more the resistance.
1.2417VRef / 2R74 = 0.453A
1.2417VRef / 2R74 = 0.453A
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