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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
206 posts
 
Thanks wrm57,
Calvin
ps68
230 posts
 
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!
dangcaonguyen OP
206 posts
 
@ps68 is the KR ampizator the one? I see it on ebay for $600.
Thanks
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.
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