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From what I can see the gether on the 1B3 has turned white a sure sign the tube has lost it's vacuum and is dead, I'd replace it if I were you.
I see at least 6 red and one green plastic molded tubular paper capacitors those NEED to be REPLACED they are every bit as bad as the wax and cardboard shell type paper capacitors IF NOT WORSE.
Back in the day the same chassis was often offered in a plethora of cabinet models with a variety of CRT sizes/types depending on cabinet...If one or more of the CRTs it was used with was a metal cone type then there would have been a HV door-knob style capacitor in place of that piece of ceramic, and it may have been easier/cheaper on the all glass CRT models (if that chassis served both types) to simply leave out the expensive unnecessary cap and toss that ceramic insulator in...Rather than drastically change the HV rectifier mounting in the glass CRT model....It could also be a hold-over from an older chassis that did drive metal cone CRTs
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