Quote Originally Posted by W3WN View Post
...Sounds like there are only a handful of Heathkit rigs that are rarer than this one... such as the famous SB-240 prototype...
And the synthesized digital VFO for the SB-104 (got one).

And the SB-671 tuner, predecessor to the SA-2040 (ditto).

And the proof-built version of the HR-1680 shown below. That's sitting in my collection as well...

HR-1680.jpg