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 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.
Hello dangcaonguyen,

Excellent news on solving your hum issue, thank you for doing this research for us.. :)

Regarding the rectifier, I have tested many, and have a few favourites that to me and friends are stand out options: KR Audio 5u4g being the first, a wonderful match and so full and open sounding. Second is not generally available off the shelf so to speak, and it is the Ayon 5u4g. It is a large tube which requires a simple mod to fit into the psu case, but it is all that the KR is with tremendous bottom end drive, and is probably my favorite. Next I will test a KR Zirconium 5u4g, if this can improve on either the 'standard' KR or the Ayon, I have my phono stage to grow old with.. Have fun.. btw, none of these are cheap!