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Originally Posted by jroberts500
I hope to find out if I can aquire whatever liquid stuff that gel layer may be.
Seems like it would be used for other things as well.
On this CTC-15, is it normal for the CRT filaments to come on too bright then quickly go to normal glow when power is first turned on? I think I remember it being that way but I was a kid when I last saw one around '80.
Thanks, John
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I don't believe so... That's a parallel filament circuit, and the CRT filaments should warm up normally. If it were a series set, I'd OK it because in a series set, there will be some filaments in the string which will light faster than others, so those staying cold longer (less resistance) will dissipate all the current across the ones that warmed up earlier (more resistance). Probably nothing to be worried about, though. Just to be safe, hook an AC voltmeter across the filament wires to the CRT and watch the readings as it warms up. See if somehow the filament voltage is surging. If so, it might be a fault such as an open ground on the power transformer, or possibly there is a thermistor in the CRT filament circuit that might be shorted. I can't remember if there is one.
Charles