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
To answer your question regarding tubes, all of the stock tubes in the Allnic are NOS except the rectifier.  You already have a NOS RCA but other rectifiers that Albert suggested are Tung Sol, Valvo, Mullard, and Cossor.  Mullard will be warmer whereas the Tung Sol will be leaner. 
Thanks everybody. I am glad as nothing serious happened.
I am sure that I will do tubes rolling in the next few months. I am very satisfy with the sound i get with the RCA now. But who knows...
Thanks again.
Calvin

dangcaonguyen OP87 posts04-29-2018 5:38pmI am on the west coast, Southern California.
Late to this thread. Glad you figured it out. For future reference, Roger Modjeski of Music Reference is authorized to work on Allnic gear. He’s up here in the SF Bay Area. Terrific guy, and one of the most knowledgeable techs you’ll find.