Re: DAC 90A Smoothing Capacitor replacement
Don't chuck away the old UL41; even if you don't try any method for recovering it; even a valve that "works but hums" is enough to prove whether or not another valve of the same type is dead. But do label it carefully when you stash it away; otherwise you run the risk of forgetting what was the matter with it, fitting it in a set and then starting looking for the cause of the hum .....
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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