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Old 09-27-2020, 10:31 AM   #7
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Join Date: Jun 2012
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Default Re: troubleshooting definitive technology prosub 60

If you have a variac, that would work the best so you could increase the a/c voltage slowly. If you don't have one then you can use a lamp, but the wattage of the lamp is not that critical. It is NOT the lamp that is drawing the current, it is the unit under test. If there is a short in the amp, the lamp will light up full brightness, if the amp is not drawing a lot of current, the lamp will usually light for a second (as caps charge etc.) then dim.

Just a note that if you used a very low wattage lamp (25watt) even a working amp may not operate so you might assume a problem when there was none.

Last edited by R_J; 09-27-2020 at 10:36 AM..
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