March 9th, 2008, 10:05 AM
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#366 (permalink)
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Friend of Leo's
Join Date: Mar 2003
Location: Park Ridge, NJ
Age: 62
Posts: 4,670
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Quote:
Originally Posted by red57strat
You may but not always.
The first time I ever watched an amp being serviced, the tech drained the caps but shorting them to ground with a screwdriver. It made a loud crack noise and sparks.
The amp hadn't even been plugged in since the night before.
Electrolytic caps can and often will carry lethal voltages in them even after the amp is unplugged for a long time!
Even after you've drained the caps, the voltage can come back up, even with the amp unplugged. If you leave a digital volt meter connected you can actually see this happening.
Drain the caps every time your in there!!! It's the only way to be safe!!!
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+1 
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