Way off subject, didn't know where to post...

[pikingrin]

Like the title says, this is not even recording related... If I need to post elsewhere, or even just delete it, please let me know. Hopefully I may get some kind of answer, seeing as how some people on here know a bit about the internals of electronics.

My dad has this Kenwood amplifier made in the '70s, which has a phono pre in it that is, in the best terms, kind of scratchy. We play the radio, works fine, put a tape in, works fine, put on an album (on the brand new Technics turntable I got him for christmas), sounds like shit. We opened up the case today and dusted it all off, but I (in my very limited knowledge of electronics) could not see any reason it would be doing this. All of the electronics are on a PCB which would be a bitch and a half to get out of the case, but all of the solder joints seem solid from the topside.

Anybody know about this kind of stuff, or where I could be directed to be able to fix this?

 

[c7sus]

Ground the turntable to the chassis of the Kenwood.

Contact cleaner on the Tape/Phono/FM selector switch.

 

[pikingrin]

The turntable is grounded, I cleaned all of the contact points on the back of the receiver, but how would I go about cleaning the selectors switches? I can't find a pic of it, but it has 4 buttons on the front that select what the receiver is doing, and all you see in the case is a spring loaded mechanism like a ball point pen would have. The PCB is pretty well laid out as far as labelling, what would it do if I just sprayed it down with contact cleaner and wiped it off? We dusted, but I know we didn't get it all off of there, and I'm thinking that could be part of the issue.