Sorry guys I can't resist the 12-/240 discussion...
When I was rebuilding my LK-500B power supply I replaced the caps with
humongo caps. I was bothered by the pecular "bong" from the transformers
at startup so I added step start. A 12v relay connected to the control
voltage
and a couple of 10 ohm resistors in series with the primary, shorted out
by the
relay. So at turn on we get 1/2 voltage on the plate for about 1.5
seconds as
the caps charge, when the primary current goes down the 12 volts rises.
When the relay clicks in we step to the full voltage. Kinda like a big
klystron
power supply only they have three levels over about 8 seconds. (As I recall)
Now for the kicker , if I ran the supply at 120 instead of 240 (see
earlier posting)
I wouldn't use as much electricity and thereby save money and increase
the step start
timing.
What a country!
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