[Penthode]

The 1947 RCA 721TS is still chugging along on it's original electrolytics. As I pointed out earlier, if the capacitor dielectrics are slowly and carefully reformed and the capacitors are afterward tested to confirm low leakage, they will last and last. This set had sat dormant for nearly 60 years in a house near Schenectady NY. So it must have been purchased to receive WRGB in those days.

It must be well over a thousand hours since I did the minimal rrevival, replacing only the paper capacitors which would likely fail. I left in the paper capacitors which are shunted by resistances 1Meg ohm or less.

The set is frequently run the set for hours at a time. had it on this evening when I recalled this thread.

I will check in the next year or so with another update.