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Old 14th January 2013, 10:27 AM   #41
DF96 is offline DF96  England
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Cathode resistor too small, failed open circuit so full current/voltage fed into bypass cap?

Switching off quickly then attaching a meter might have given you an opportunity to learn fault-tracing techniques.
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Old 14th January 2013, 01:27 PM   #42
Cassiel is offline Cassiel  Libya
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Quote:
Originally Posted by DF96 View Post
Switching off quickly then attaching a meter might have given you an opportunity to learn fault-tracing techniques.
Yep, that's the standard procedure. This time it was late and I was pretty tired and.... I just let it go. Laziness. This is the second time I do this. As for the reason of failure I can only think of two possible scenarios: the tube's central pin was missing so I may have plugged it the wrong way or it was a loose wire that I forgot to remove and may have caused a short (the cap was correctly wired).

Don't go hard on mistakes - they often teach you valuable things.
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