I've got a dual chassis 16" IIRC 24H20 porthole. CRT was stone dead and Nick and Mark hit it with a CR-70 rejuvinator and got it up in to the mid to upper red, set is all original caps except for 4-5 papers that were swapped for maroon drops in the 60's or 70's...It somehow came to life with a reasonably bright picture in that state.
Aside form the weak flyback on some portholes these sets are indestructible.
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