Motorola 9T1, did I ruin it?

[jeyurkon]

Originally Posted by dano

John, I replied before I saw your message. I have had pretty good luck with origional selenium rectifiers in old radios, as long as they aren't getting warm/hot. I haven't run the set with the chassis out of the cabinet, so I'm not sure how these are doing... but I was origionally going to keep them in place as long as they were working okay. I never thought of them hurting the ballast... so I might rethink that. Would a resistor replacement cause any cold filament surge that might hurt the CRT heater? Shouldn't be a problem while I'm testing as I'll be bringing it up slow on the variac, so I'll look into a resistor sub for that. Banderson: No flyback? Shows what I know, but I'm glad to hear that there's one less thing to burn up!

I'm inclined to save seleniums also, and have had good success with radios and test equipment. In a TV I was restoring I wasn't as fortunate. The selenium tested out fantastic, but when I tried to use it, it would start warming up and the voltage drop would increase. I have some NOS ones but they didn't test as well so I was reluctant to try them. There's a procedure for reforming them, but I haven't tried that either. The procedure I found was used by the railroads and their seleniums were quite a bit bigger.

I finally decided it wasn't worth the bother of trying to keep them.

John