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The 721TS had only another 7 hours this past couple of days reaching about 80 hours. No sign of the capacitors failing.
Have been running one of the 630TS capacitors I had reformed at its full rated 450 volt rating. Will leave this for a week and monitor the leakage current.
One consideration: the late 40's RCA sets had full wave power supplies with capacitor of relatively low capacitance e.g. 40uF to 80uF at 450v. There are a number of factors in the design that put less stress on the electrolytics in these early sets: ripple current in the full wave rectifier, low deflection angle tubes which required less defection power etc. In the fifties, the designs pushed the limits of components to keep the consumer purchase cost down. The electrolytics were stressed with higher ripple currents, increased capacity in the same form factor. I know the RCA CTC11 color set I have has had to have all its electrolytics changed. The voltage doubler capacitors have been changed twice!
So there are various factors at play here. There is no one size fits all solution and I am only citing the specific capacitors used by RCA in their sets in the late 40's in this instance.
As this is a hobby endeavor and I am speaking from a hobbiest point of view with regards to conservation as opposed to wholesale rebuilding, intelligent assessment of the components is advised. The 1949 RCA 8T243 television which I am still running on its original capacitors I have owned for 50 years and the set still performs fine.
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