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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 1 response by almarg

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almarg
9,670 posts
 
I see that your speakers have a ground terminal on the rear, in addition to the high frequency and low frequency + and - terminals, with the use of the ground terminal being described as "optional." This is just a wild guess, but if by any chance you have been connecting that ground terminal to the amp chassis, or to some other point on the amp, try disconnecting it altogether.

Regards,
-- Al

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