This is worth reading.
http://www.repairfaq.org/sam/reppic/horiz-tv.pdf
If its a simple variac add an AC ampmeter to the set-up.
The set will usually start running about 75V but the regulator
will kick in soon & bring the 125V up almost instantly. Keep your
amps under 1 amp. A normal running set will draw abt
.75 amps at 120 VAC, .5 for the HV. With this type regulation you may
have to do the bulb trick. IIRC they start to work but
pulsate then as you go up kick in 100% quickly.
BTW the variac we used was a Sencore power right or the B&K
equivalent. They have a variac, isolation, metering for volts
& amps & leakage test. A must have for any newer sets or
working on hot chassii.
73 Zeno
