Hi Jim - I use my old D-104 with the original crystal cartridge all the time
with my K2 and get great reports. No need for a preamp, etc. as the crystal
cartridge has output to burn!
The problem with using a nonamplified D-104 with the K2 is that the D-104 is
a very high impedance mic and the K2 requires a low impedance mic. An
amplified D-104 takes care of this by using the amp in the bottom of the mic
stand to do the impedance matching - just be sure to take care in adjusting
the "volume" pot in the base so you don't overdrive the audio input in the
K2.
If you don't have an amplified stand, just running the D-104 straight into
the K2 will result in lots of drive but the audio will be very narrow and
"tinny" - sort of like talking through a couple of cups with a tight string
between them!
The "secret" to using an unamplified D-104 into a low impedance is to put a
resistor in series with the D-104 mic output (can be done inside the base of
the stand) - something between 300K and 500K usually will allow the lower
frequencies produced by the D-104 crystal cartridge to actually show up
while decreasing the output to an acceptable level.
A lot of us "old timers" put a 1 meg pot in series with the audio output
from the D-104 cartridge (mount inside the base of the stand) and then
adjust it for the best balance between "tone" and output while listening to
the audio in a separate receiver. Do this and enjoy your veteran D-104!
Have fun. 73 es gud dxing -- Don N4HH
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