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EAR 890 crackle and hum

Having trouble in having trouble with an EAR 890.  It crackles in the super tweeter and hums in the midrange.  I have two 890's.  One is dead quiet.  Placing the second one in the exact spot, same connections, same PC, same tubes and the noise persists.  Sent off for service and no issues found.  Contacted EAR and virtually no response.  I run with an EAR 912 through Tannoy Kingdom Royals.  The noise is present when used in single stereo or in mono block configuration.  Noise is audible from 10+ feet and is a big distraction.  The noise is there with volume off, on low and between songs at higher volumes.  Any ideas?

drpat

Showing 3 responses by drpat

drpat OP
55 posts
 
Dan, I have taken the offending amp and placed it in the same spot, same IC's, same PC, same tubes, same pre, etc and even all by itself(the good one is totally disconnected) the noise persists

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drpat OP
55 posts
 
Joeinid, thanks for the thoughts.  I have tried different tubes.  The one 890 plays perfect but the other( using the exact same tubes) persists in its noise.  When sent off for service, the issue isn't recreated on the shop table.  Granted, they aren't using the same speakers for testing.  Regardless, one amp is perfect, the other is not.
drpat OP
55 posts
 
Almarg, no I have not.

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