Other Gear > Phono

Uturn audio-no sound

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aragorn723:
I just changed the cartridge on my Uturn Orbit, and now don't have any sound at all with the new cartridge.  Only sound is a loud humming sound.  What could be wrong?

Dave

Thermioniclife:
Is there a ground wire connected the phono preamp. Terrible buzz is an indication of a poor or no ground.

aragorn723:
There is no ground wire from the Uturn to the phono preamp , it's internally grounded.  I'm wondering if maybe the cartridge wires aren't hooked up right?  The London cartridge has color coding on the pins. 

Red-right channel positive
Green-right channel negative
White-left channel positive
Blue-left channel negative

The wires from the Uturn had these colors, so I just matched red to red, blue to blue, etc.  Maybe Uturn is using a non-standard color scheme?

Dave

Thermioniclife:
I am not familiar with that cartridge but you need a good ground to the pre. does the cart mounting tabs have a conductive pad on them? If so you can try a small gauge wire connected to one of the cart mounting screws to the phono pre as a test. It's been decades since I have had a turn table and vinyl. Perhaps you could call the manufacturer for advise.

oguinn:
U-Turn has really great customer service. I’d email or call them
 

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