On Jul 30, 8:35 am, "Rick (W-A-one-R-K-T)"
wrote:

Was there a DX-100A?

Not formally, but you may see informal references to "DX-100A"

What happened was this:

The original DX-100 used a relatively-small air variable loading cap
for fine adjustment, and a bunch of switched fixed caps for coarse.

In practice, this combo turned out to be unreliable in ham use, and in
the DX-100B the combo was replaced by a large air variable loading
cap.

Heath sold a retrofit kit so that DX-100 owners could replace the
small-air variable-cap-and-bunch-of-switched-fixed-caps arrangement
with the DX-100B style setup. Retrofitted DX-100s became known as
DX-100As. I don't know if that's an official Heath name or just
something hams made up. I do know that when Heath came out with the
new model, they called it DX-100B.

At least that's the history I knew.

--

btw, if your DX-100 has only one fuse in the primary side, it needs to
be modified so each power transformer has its own fuse.

73 de Jim, N2EY