need troubleshooting help--amp hum

paulbottlehead

Active Member
Soldering wires to pins on an Alps blue is a no go. The Alps blue is designed to be mounted to a PC board. You need to mount it to a PC board or use a different pot with solder lugs.
 
... the only problem is the volume pot. i have it turned all the way up and have been using the volume control on my LDR pre instead (which is how i plan to use this amp). ...
If you're never going to use the pot, why not replace it with two resistors, one for each channel? That would solve any hum problem caused by the pot, and might even sound a bit better than a functioning pot.

cheers, Derek
 

rogerfederer

Junior Member
If you're never going to use the pot, why not replace it with two resistors, one for each channel? That would solve any hum problem caused by the pot, and might even sound a bit better than a functioning pot.

cheers, Derek
i might use it some day. also, have a hole in the wood base that would be ugly to fill.
 

rogerfederer

Junior Member
If you're never going to use the pot, why not replace it with two resistors, one for each channel? That would solve any hum problem caused by the pot, and might even sound a bit better than a functioning pot.

cheers, Derek
Deke,
I kept coming back to your suggestion and finally decided you are right on! I am unlikely to use a volume pot on this amp and it is just a source of noise. I bought the small volume pot from the original zkit bill of materials and installed it on the board; that way there are no wires to pick up noise for a pot elsewhere on the chassis. i will leave it turned all the way up.
I commissioned a nice Decware logo to hide the hole where the pot had been and presto!
I played it an hour or so today and it is very quiet.
Many thanks to @paulbottlehead for his patient help when I was bumbling around trying to fix the hum.
Doug
 

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