In article .com,
" wrote:

2. A Heath HA-201A 2 meter fm amplifier. A schematic would allow me to
figure out how to re-bias this amp for linear service. Please note that
this is quite different from the HA-201 (without the "A" suffix) for
which there IS documentation at the BAMA site.

Lenny-

Many yers ago I had a couple of the HA-201s. They had a chronic problem
of self-oscillation, which I eventually managed to tame. I did not
remember that there was an HA-201A version, but it stands to reason.

I have a couple more of the HA-201s that I picked up at a Hamfest, but
haven't had a chance to do anything with them. I would be interested if
you find any information about the difference. As I recall, my "fix" to
the older version involved adding multiple filter capacitors across the DC
power input. Perhaps there is a better way.

73, Fred, K4DII