[R-390] Nixie Tube Freq Readout

[Drew P.]

On tunnel diodes, John wrote:

"Many years ago Heathkit made a tunnel dipper.  It was a real dog compared to Millen tube type meters.  I still have the darn thing and it works, but I don't use it.  Perhaps I should offer it on e-bay."

Methinks the term "dog" to be overly complimentary.  I also have a Heathkit Tunnel Dipper and note its many problems.  Chief among these is its tendency to refuse to oscillate at all in the lower 1/3 of its dial range, and an extremely touchy meter seting adjustment.  It really is much better, largely confined to use, even, as an absorption wavemeter.

Drew