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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
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islandmandan
1,260 posts
 
drpat, do the amps share the same power outlet? If not, I'll suggest you try the offending side using the outlet that powers the non-offending side. Other than that, I see nothing that may account for such anomalous behavior.

You may want to try a different amp from the EAR amps. Quite a puzzler.

Best of luck,
Dan





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

p
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joeinid
658 posts
 
You could try a new set of tubes or swapping the tubes. I had an 890 and had some issues. Turned out to be a pinched wire during assembly. It was so bad that the it cut through the insulation and was shorting one channel out. The amp sounded awesome but it took a second tech to find the issue.
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