[Elecraft] K3 / MH2 - No TX Audio

[VaibhaV Sharma]

Hello,
Here is my story -

Bought a 4 month old K3/10 off ebay (yes) from another radio operator in
Texas. Unit arrived in excellent physical condition except that it won't
transmit any audio using the MH2 hand mic.

The radio has -
* K3/10
* KAT3
* 2.7 kHz 5 pole filter (standard)
* 5ppm oscillator

I have searched through the tubes and done the following -
* Enabled mic bias
* Enabled L./h. for front mic port
* Adjusted mic gain / CMP / moni levels
* Reset the unit to factory defaults and repeated the above
* Upgraded the unit to latest firmware and repeated the above

No amount of coaxing or loving is helping. The mic key-up works (TX lit)
but no audio is transmitted. SWR / PO meters don't move at all.

The radio "does transmit" when -
* ATU cycle is kicked in
* Rear mic port is used with a headset
* CW paddle is used

I sent a stinker to the ebay seller (awaiting response) but after hours of
debugging, wanted to find out if this is just a dead MH2 hand-mic or could
be an issue with the radio? Is there a way to test the MH2 electret element
separately?

The problem might just be between the MH2 and my chair and I am here to
learn.

Thanks in advance,

-- 
VaibhaV Sharma
W7VAI