Quote:
Originally Posted by Eric H
I would think there was originally a plastic insulator that would have filled the gap.
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Not really. The metal part only goes from the face to the vertical line between the 27" radius and 54 degree markings from there back to the neck it is all glass and an insulator would be unneeded on that glass part. What gives that section away as glass is that section goes from straight conical to parabolic conical...That and I can't think of a CRT where the metal bell goes straight down to the neck...most metal cone CRTs dead end with something like a 4" diameter opening and then glass tapers down from there to the neck.
I don't think the 8AP4 is the correct type for this set unless the screen was quite recessed. I'd look at any P4 tubes in that general size range, then look for non-P4 types (if it was a prototype it might not have used a P4 screen), if nothing matches then I'd conclude it uses a custom CRT....At which point I'd grab the closest tube that can be had for a reasonable price and call it a day.