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.Oooops sorry Salas correct VRef is 1.2417V
Probably a minuteI didn't measured the time but I think more.
More or lessProbably a minute
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.Schematic pls? How to implement?
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