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Bringing up old valve radios slowly?
"gareth" wrote in message
... Having now borrowed my friend's Variac, what is seen as good practice for ramping up old valve radios to reform the capacitors? Start off at, say, 50VAC and then increase by 50VAC every 1/2 hour until 240V is reached? Thank-you to all who replied for the hints and tips. The comments by Michael about ESR only being of real concern for high frequency switchers was interesting. What I shall do is, firstly, remove all the valves ("tubes" to the W and VE contributors :-) ), Then, because initial continuity checks suggest some discontinuity around the incoming mains, do some disassembly, because although the chassis is spacious and generally well laid out, it is crammed in around the mains transformers such that even my dentists' mirror cannot see around the corners. The "rectum friers" seem to be silicon ones, so, as I will already have done some dissassembly in that area, I plan to put a 100k resistor between the rectifiers and the reservoir capacitors (should that be,"condensers" if an old set?) and then bring up slowly on the variac. Hopefully there will not be too much vapour (q.v.) in this project! |
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