Amp Hum

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

Definately call B&K they are more than happy to advise you on potential problems or even suggest a fix. They are only in NY and a pleasure to deal with. A hum that is isolated to the component can be two things... faulty ground or
bad or noisy transformer or power supply...
take the piece over a friends and plug it in... see what happens and if hum still persists.. call B&K.
Good Luck!
Joe

The suggestion of a faulty ground seems a likely possibility. With everthing unplugged except the amp, ground the amp from the ground of one of the RCA plugs to ground at the outlet. I had a Rowland 5 that had this problem. It was just a loose wire on the input of the IEC connector for ground. It also got worse over the first 20 seconds or so of warm up. I was rather surprised that the hum was so bad since the unit was effectively grounded through the interconnects and other equipment--but it was.

...a blondie is trying to start-up her malfunctioned Mercedes and it doesn't start.
the other friend-blondie stops next in her Jaguar and trying to help:
--did you wash the dashboard?
--yes!
--dod you wipe the bumper
--yes!
--is it shiny?
--yes!
--did you wash your mirrors; are they shiny?
--yes!
--sorry darling i can't help :( call the Mercedes Service...

This could be a lot simpler than i thought. I've run into this on other amps, including B&K. Pull the lid and check to see if the toroidal transformer is tightened down. I have seen where these were not snugged down properly at the factory and have vibrated loose in transit or over time. I would suggest unplugging the unit from the wall first though while leaving the amp on. Let it sit for a few minutes and then make sure that it is snug using the proper tools. Sean
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