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Sick and tired of hum-please read

JBL 4345's
Canary 500 monoblocks using emission lab 300B tubes
PS Audio MK ll Dac
Dish Network VIP 612 DVR
Dedicated 120 line from panel

You name it, I've tried it. I have a low level 60hz hum that I for some crazy reason am unable to get rid of.

Lifting the ground, power re-generators, cable changes, equipment to equipment grounding, Satellite new cable and grounding and turning off the whole house except my music room has not resolved. The only explanation I can conclude is that 300B tube amps and very high efficiency speakers will always produce hum. Drives me crazy. This subject has been beaten to death but if any of you guys has any out of the box ideas other than the obvious, I would be interested to hear. Thank you in advance
invstbiker
chadeffect
586 posts
 
Have you tried other amps including SS?
krell_man
827 posts
 

Try completely removing the DVR and substitute a CD player or transport.

I had a hum from the cable before, that might be your culprit.

Chuck
glenfihi
525 posts
 
Sounds like you have tried most things. Might there be any non audio electrical items in room such as Fluorescent lighting. And outside of repositioning your gear, which you may have done already, play it louder. Alas...the price of a system you love.
pbnaudio's avatar
pbnaudio
1,613 posts
 
You have efficient speakers so there may be some residual hum from your Canary Amps ( I have a set of REF2) that you cannot eliminate. Start from the very end ie. connect speakers to amps, short the inputs with shorting plugs and turn them on, the level of hum you have at this point is your base level. Then work your way forward, connect the DAC to the amps if hum increases or appears you have to look at how equipment is grounded. You mention that you have dedicated circuit (s) to you system - if two circuits one from each leg of the feed to your house, this is a certain way to introduce hum in your system.

Best of luck

Peter
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