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
Good catch. I didn’t even think of that. Hope that solves the problem.
Then you can get down to the serious business of rolling rectifiers. :)
Hi everyone,
I am happy to report back that the problem is fixed. Its just the switch on the back of the unit. I firgot to switch it back to RCA. (What a stupid I am). Please apologize for my ignorance.
Now I am very happy that the H-3000 is as quiet as a tombstone.
About tube rolling, what are you reccomend? The seller already installed the RCA nos rectifer tube on the power supply. But if you know pf the better tube please tell.
 Thanks 
Calvin
Calvin- quite a few threads on the subject. A lot of the rectifiers are cheap enough that you can try several for yourself and see what works best in your system. I am presently using a GEC U-52, have used a fat base first series Mullard (the earlier metal base is preferred) and there is a military RCA from WWII with a particular getter arrangement that is supposed to be good. (Perhaps that's what's in there). You might look at Dub-Step Girl's Massive Rectifier Shoot-Out (or something like that)-- she does describe the general character of many rectifiers, but I think the results will still depend on the circuit and what you are chasing in the system.
I'm glad the problem was simple to address. Enjoy your new phono stage!
Congratulations on the H-3000 and glad that you have it sorted out.  Now, find an HA-3000 to pair with it and kick that wonderful phono up to even greater heights!