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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
ps68
230 posts
 
Hi,
Yes, it is the lampi anniversary version here:
https://best300b-com.myshopify.com/collections/kr-audio/products/kr-5u4g-lampizator


pops
2,275 posts
 
I have only rolled one rectifier tube in my H3000, a big base Mullard and could not believe the improvment over the stock tube.  Have fun with this when you are ready, there are many options.
dangcaonguyen OP
206 posts
 
Thanks ps68 and pops,
I will try it when my budget allows. 
As of right now, compare to my Zyx Artisan 2 and H-1201, I am enjoying my new h-3000 a lot more. 
Thanks to all.
Calvin
dangcaonguyen OP
206 posts
 
Just ordered the CBS/Hytron 5U4G ST to try. Will report back in a week or two.
 Thanks gents.
Calvin
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