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Allnic H-3000 hum when mute button engaged.

Hello Goner,
I have just purchased this wonderful phono preamp used. The unit is running perfectly and quietly. There is only one problem, that is when the mute button is engaged, my speakers hum badly on bith sides. Anyone got any idea on what happens. Also, when the button engaged and disengaged, it produce the pop sound. Is it the possibility that the mute button is malfunctioning? Can a simple deoxit fix it?
 Thanks 
Calvin
dangcaonguyen
dangcaonguyen OP
133 posts
 
@whart and @lak 
Thanks for your suggestions. I will contact Albert, but for now i am still waiting for the answer from the seller before moving forward on what to do with the unit. It is strange, I have emailed him for 2 days without answer. He might not checking emails over weekend.
Calvin
lewm
6,770 posts
 
Calvin, Do you live on the East Coast, USA?  If so, I can strongly recommend Bill Thalmann in Springfield, VA. Bill is a fine person and smart repair guy who is completely honest.
lewm
6,770 posts
 
Forgot to note that your Shindo stuff is strictly single-ended.  So I don't know whether you can really do true balanced mode, to test the function of the switch.  (I am not even sure how the Allnic achieves balanced output.  It might be via a transformer, since I would bet the circuitry is actually SE.)
whart's avatar
whart
1,930 posts
 
@lewm- you may already know this, but Bill Thalmann is authorized to work on the Allnic gear. And I agree, he is first rate. He restored a bunch of vintage gear for me that give me great joy in my second system. Nice man to boot. 
dangcaonguyen OP
133 posts
 
I am on the west coast, Southern California. 
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