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Originally Posted by Chad Hauris
I know Sony used a direct heated filament cathode (no cathode sleeve) on the crt some of their small b/w sets for very quick crt warmup...I guess they couldn't have really used that on the Trinitron could they?
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Interesting. I don't know, but I wouldn't think a filament cathode would give a very good spot, so maybe it was just OK for small B&W tubes.
I don't know about Sony, but I do remember CRTs going to quick-warmup cathodes in place of instant-on. The quick warm-ups could come on in about 12 seconds (vs. 20 seconds or more in the old sets). Of course, the benefit is only in a solid-state chassis where you are not waiting for a whole bunch of other tubes to warm up.