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!

128x128tommypenngotti
cakyol's avatar
cakyol
940 posts
 

İs your tonearm grounded ?

normb's avatar
normb
166 posts
 

I was reading the cartridge installation instructions for my tonearm last night- SME 3009 S2 improved. 
 

it said on some cartridges there’s s tab on the green lead which has to be disconnected from the headshell or it will cause a ground loop and hum on the RIGHT channel (white signal, green ground), IIRC.

 

FWIW

tommypenngotti's avatar
tommypenngotti OP
219 posts
 

@audio-union I will check the power with my multi meter ...thanks 

 

@cakyol no idea on tonearm grounding...it's a VPI Super Prime Scout w 10.5" tonearm....I know the headshell on Hana cart is grounded 🤷‍♂️

thanks 

davidrolon's avatar
davidrolon
39 posts
 

Had a similar problem. Turns out it was the wifi router. Moved it and hum disappeared. Sometimes it's the simplest things hiding in plain sight.

defendert's avatar
defendert
21 posts
 

I also had that problem with using Cyrus gear. The power inlet fitting on them only had a live and neutral and no earth. So when i changed  my amp to parasound that had an earth on the power supply fitting, the hum went away. So check the power inlets. 

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