I was thinking of making a HV regulator for my tube projects, but I'm in serious lack of isolation transformers, plus they're not as common nowadays as they have been in the past, so the circuit here is a quick workaround. Alternatively you can skip it altogether by tying two 12V transformers back to back (secondary-secondary), but I have a spare 20V/6A laptop charger laying around, thought I'd utilize it.
