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Cary SA500.1 mono blocks

I just added the 500.1 mono blocks and I have a hum on both that I can't get rid of .I've tried to lift the ground pin on the PS audio AC12 power cables with no change. I tried different power cables with no effect. The amps are on their own 20amp circuit plugged into a Richard grey 400 . Any help would be appreciated thanks .
kwa69

Showing 3 responses by brownsfan

brownsfan
1,508 posts
 
Something is wrong. I owned the 500.1s for about 2.5 years and they were dead quiet. Do they hum with no inputs connected?
brownsfan
1,508 posts
 
Al, good catch as usual. KWA should call Cary on this. If this is the issue, he could damage the amps. BTW, the first iteration of the manual did not have that warning. It was added after the issue was observed by owners.
brownsfan
1,508 posts
 
Kwa,
Glad this was something minor and you got it fixed. If you need tons of juice, these are good amps.
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