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How do I stop the Humming from my LP12?

Hi all this is my first turntable. I am new at this. I have two problems. I purchased a used Linn LP12 circa 1974 with the original power supply, Infinity Black Widow tonearm, AT - 30 Moving coil Cart, AT step-up transformer, Creek 5350 Integrated with built in MM phono amp, Vandersteen 2ce speakers. The cartridge came premounted by Brooklyn Audio. When I play a record, the music sounds good, but when there is no record playing there is an audible hum coming from the speakers that gets louder as increase the volume level. When the Amp is in any other mode like CD or Aux, there is no humming noise. Any thoughts as to what this is and how to eliminate it? My second problem is that with the table set up according the instructions I can hear the belt rubbing against the top of the guide that it threads through when it is spinning. Even when I try to adjust the belt to the bottom of the subplatter disc, and then replace the platter, the rubbing continues. Any suggestions would be appreciated. Thanks - Dave
bricksalt
rwwear
2,867 posts
 
It should be on the tonearm cable. If not add one the chassis or tonearm. There should be a screw someplace you can loosen and wrap a wire around.
paulcreed
559 posts
 
You might want to check under table there is a ground wire that is grounded to the chassis it can come loose and cause a hum. Take your outer plater off and then support the inter platter or remove it. Make 2 stacks of books and place table on them so you can look under the table to find and follow the ground wire coming from tonearm area to the chassis. Mine has done this to me twice in the last 4 or 5 years it will produce a fairly loud hum. If you touch the cartridge mounting screws or touch tonearm does it get louder.

chakster's avatar
chakster
6,144 posts
 
Oh, someone already pushed an old thread from 2007

It is interesting, because a few members bulled on me when i said something about Linn Basik quality.

Pretty funny, you guys must face it (about the belt drive):

I purchased a used Linn LP12 ... My second problem is that with the table set up according the instructions I can hear the belt rubbing against the top of the guide that it threads through when it is spinning. Even when I try to adjust the belt to the bottom of the subplatter disc, and then replace the platter, the rubbing continues.  



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