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Thanks Big Dave. That is pretty much what I was afraid of. Some confirmation is that the filament resistance was reasonable when I took the tube out. Now its open, so the tube is dead. Drat... guess its time to start a frustrating search for a replacement. The set was my mother in law's so at least I'm not out any serious investment beyond the price of the new caps.
Meantime I can get started on getting the CobraMatic rehabilitated.
I think I sent you a pdf of a service manual for a 1957 Zenith a couple years ago. Did you ever finish that renovation?
Paul
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