2. analog
  3. 173702-89448

Turntable Hum

Any help appreciated!

Low pitched hum coming from TT input ...even when TT is not running . Hum is noticeable at about 1/4 volume & really bad at 50%

Manley Monoblock Snappers

VPI Scout w Hana MC cart right next to amp on table (moved TT away from amp to floor made 0 difference)

Allnic 1202 Phonostage grounded to VPI TT (on floor below JBL speakers & main speakers right to the left Tekton Encores)

Manley Jumbo Shrimp Preamp

Klark Teknik 32 band EQ

All cables (interconnects) recently replaced - Mogami

 

I tried ground lifting the TT motor - no change

unplugged tv & nearby laptop - no change

unplugged all lights nearby - no change

 

I suppose my next troubleshooting venture is to run a ground from phonostage to everywhere & start touching things? Phonostage seems to be the culprit....

😕

 

Thanks everyone!

tommypenngotti

Showing 1 response by mr_m

mr_m
1,900 posts
 

I had a similar problem with hum like what the OP described. Tried all the usual grounding tricks. They helped somewhat,  but just couldn't eliminate the problem completely. 

Then I was given the suggestion to change turntable power supplies. Turns out my tt came with a cheap switching wallwort power supply.  All I had to do was order another wallwort power supply, only this time went to a linear type.

 Cost, 15 dollars. And voila!!! Hum totally  disappeared.  Not sure if it will work with what you have, but worth a try if your tt has a cheap switching power supply.

 

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