Quote:
Originally Posted by Adam
Yeah, that big oval oil cap is totally shorted - you can see it even with an ohm meter - nearly 0 ohms, dead short.
I just bought a NOS Quasar replacement at the exact value 3.5uF - 440VAC, but how critical is the capacitance for this - I see lots of 3uF or 4uF - 440VAC motor start capacitors around - would that sub for it if this old Quasar one doesn't check out?
And I replaced all the 22-5001 caps first thing back when I got this TV in 2016.
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370 volts AC (p-p) is the minimum rating, capacitances can vary a bit as the ratings seem to be given in ranges. 120 volts is AC rms, for P-P its 340 volts!
I often find similar caps inside appliances having a "permanent split capacitor" winding. A/C and Dehumidifier sealed compressors have a "start" winding with external cap. Any cap tester will read that value, regardless of it being used on AC. Many are open, but shorts in these caps (the smaller square plastic tub type) found in ceiling fans and as a high-power-factor* option in some ballasted light fixtures and exit signs. These short and cause smoky little "fires", one that recently emptied a movie theater.
* older oil-filled use PCB, beware if NOT labeled "non PCB"
The reason which Zenith used that heavy transformer, is superior voltage regulation with line volts low OR high (dangerous @ record-high 30+kV
this Z makes) this cap is intended to work with the transformer's reactance to reduce current drawn yet maintain core saturation.