Quote:
Originally Posted by DavGoodlin
Vid-Aire made one with a plug that selected between series or parallel filament strings, I dont think it isolated.
I had a 1958 Motorola series-heater set with an intermittent H-K short in its 21CBP4. The short made it go washed-out negative with retrace lines.
After I isolated the CRT filament with a perma-power brightner, video just got a bit smeary when it shorted.
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Several companies made various types of brighteners. IIRC, Workman made a brightener for the early Sony Trinitrons. They also made one called the Super-brightener that boosted the heater voltage to 9 volts. It was used on the RCA 23EP4, that had a different pin-out. The picture looked good, for how long, was anyone's guess.
