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Amp Hum

I've got a B&K AV5000 Series II amp with a hum. It gradually builds up over about a 5 second period on startup. I've disconnected everything (preamp, speaker cables) and still the hum persists. I tried a different power cord (Shunyata Sidewinder), made sure everything else was off, tried a cheater plug, different wall socket... still have the hum. I tried the Monidal Magic thing for the cable, still the hum torments me. Is it time to take it in or am I missing something? Thanks-
scrapiron
sean
6,231 posts
 
Is the factory cord actually grounded i.e. a three pin connector ? If it isn't, you might have the polarity reversed on the plug or the outlet. This can introduce a hum into the amp which is then fed through the speakers. Sean
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rslifka007
14 posts
 
If everything is disconnected and you hear a hum from this unit, I beleive you may have a transformer hum. (a noisy transformer) In this case, it would be wise to discuss this with the amplifier manufacturer. cordially, Richard..
7671
163 posts
 
Can you hear the hum from the listening position or when you put your ear to the unit. If the latter is true this is normal. Steve
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