[Yaesu] D-104. Nice sounding mic.

Mon Nov 23 11:51:31 EST 2009

Yes, the D104 can be nice mike, but some users terminate the crystal 
element in too low of an impedance, which destroys its otherwise good frequency 
response. If terminated with low impedance, the element loses ability to 
provide good low frequency response, and develops an annoying peak in the 
upper midrange. This mike was designed to drive the high-impedance grid circuit 
of a vacuum tube, typically over 300,000 ohms, so it is greatly mismatched 
if connected to a modern, solid-state radio, with its input impedance 
typically in the 150 to 2,000 ohm range. Usage with such radios requires a 
matching transformer or intermediate circuitry for proper performance.---73, 
KC3VO-Bob Curry