Colortrak CTC120

[zeno]

Originally Posted by Electronic M

IIRC there are risks to variacing SS sets such as missing drive signals allowing transistors to conduct full current and damaging themselves.

I never blew a SS set running on a variac. I would NEVER do it
to a Sony SG613 set though !
If its a simple supply all you may want to do is jump the on/off
relay & always unplug the DGS coil so the heavy current dont
throw you off.
Switching supplys are tricky cause they go from dead to full
B+ instantly. Kick start sets also a problem to get to start.
Your CTC120 is a kick starter IIRC. Things really get interesting
with newer stuff. All in all every chassis has to be handled differently
on a variac. Rubber fuses ( light bulbs) are often your friend in
troubleshooting
BTW starting a SS set at say 75V the set will draw to much current,
maybe 1.5 A. As you turn it up it drops. At full line a normal set
will draw + or - .75A, maybe pushing 1A on a 36" running
balls out.

73 Zeno