B Billy Mayo Member Nov 21, 2013 #1 Some circuits want you to turn on the AC power before the DC power or Vice verse, turn on the DC power before the AC power switch Why is that? what circuits do you guys know that are like this?
Some circuits want you to turn on the AC power before the DC power or Vice verse, turn on the DC power before the AC power switch Why is that? what circuits do you guys know that are like this?
dr pepper Well-Known Member Most Helpful Member Nov 21, 2013 #2 Some valve amps apply power to the heaters before the main dc ht rail.