Groove Tube Model One tube mic schematic?

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Junction

Well-known member
Joined
Mar 23, 2007
Messages
427
Location
Sydney, Australia
Anyone seen a Groove Tubes Model One tube mic schematic.

Got this mic with astudio I bought, cable to teh Power supply was missing, made up a new cable as per original cable schematic, but used two cables, 1 x shielded for audio and 1 x for tube supply.

The mic works but is humming badly, wanted to start with the schematic, maybe also needs a tube change.

Michael
 
First thing is to double check the earthing with respect to the two cables. You may have created a ground loop.

It is likely that the heater and B+ supply cable needs to be screened also.

Try touching the mic body to the PSU body and see if the hum level changes or disappears.
 
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