Normal
Re: Failure rateHelloI was using power-resistors, that had metal housing and were riveted in the enclosure endpieces with some paste between ( that white gook...) so the heat goes mostly through units wall. Plus one could always drill some cooling holes. I agree totally, that none of these is half as good as not having to deal with it to begin with... My Variac is a 2kW model in cast housing and wheighs about 20kg - ( 40+ pounds ) - NOT very handy to take with you, but exellent in shop.
Re: Failure rate
Hello
I was using power-resistors, that had metal housing and were riveted in the enclosure endpieces with some paste between ( that white gook...) so the heat goes mostly through units wall. Plus one could always drill some cooling holes. I agree totally, that none of these is half as good as not having to deal with it to begin with... My Variac is a 2kW model in cast housing and wheighs about 20kg - ( 40+ pounds ) - NOT very handy to take with you, but exellent in shop.
