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Repairing C414???

Posted:
Mon Jan 12, 2009 3:59 pm
by Stephen C
Anyone know of the cause of noise on a C414EB? its a common fault, and no its not the tantalums, I've already tried that.
Thanks,

Posted:
Mon Jan 12, 2009 5:48 pm
by rob
dirty capsule?
R

Posted:
Mon Jan 12, 2009 11:57 pm
by Stephen C
Thanks for the suggestion Rob. Nah, I tried a capsule from a 'clean' mic and the noise was still there. Tried replacing the 1Giga ohm resistors and the FET, but no improvement.

Posted:
Wed Jan 14, 2009 6:29 pm
by Stephen C
Ok it was a wire broken inside the insulation going from the PCB to the output transformer. How that happened inside a microphone I don't know.