[Boatanchors] Microphone Available

[mac]

Yes, heard of that.  When a carbon mic starts exhibiting polarity,  
though, it's probably getting close to the end of it's useful life.

What I do with dead T-17s these days is substitute in an electret  
element with a single transistor circuit that works as a direct  
replacement for the carbon element, i.e., no changes to the  
transmitter/speech amp's bias and input circuit.  Works great but is  
polarity conscious of course.

Dennis D.  W7QHO
Glendale, CA

On Aug 10, 2009, at 1:07 PM, W4AWM at aol.com wrote:

> Also, if the mic is isolated from ground, try reversing the polarity.
> Obviously, this will not work with a PL-068 mic jack without an  
> insulating
> bushing.
>
> John