I got one of their audio amplifier modules in 1964 for
my thirteenth birthday and it really worked quite well. Several
years later, it died when I transplanted it from one box it was
in to another and one of the leads broke off flush with the
epoxy. I think that module was made to work in a phonograph as
the input would take a crystal pickup and the 2-watt output was
about what you got with the one-tube amplifiers in a lot of
record players of that day.

	A lot of those phonographs had a motor with a
transformer secondary wound on the same core as the field magnet
for the motor.

	Anyway, one of those modules would have probably worked
nicely off the 6.3-volt filament winding when rectified and
filtered.

	I used mine for all kinds of weird stuff and once even
connected the audio input to a solar cell and let my whole class
hear the fluorescent lights in the room buzz through the
speaker. I then explained that the buzz was due to the fact that
the lights were actually going on and off 120 times per second
with each half-cycle of power.

	The amplifier was still being run from a normal battery,
but the solar cell converted any ambient light in to sound if
the light was varying. If it was steady light Sun light, you
just heard a thump when you exposed the cell to it.

	I do remember those modules well.
Butch Bussen writes:
> I remember those.  They were way cool!!!  I had a cw monitor and somewhere
> I think I still have an am transmitter.  I had one die once and broke it
> apart, just a bunch of discreet components in epoxy.
> 73
> Butch
> WA0VJR
> Node 3148
> Wallace, ks.
> 
>