The NC-101X was produced in the late '30's and I believe it was
one of the last Nationals designed while James Millen was still at
the company. It receives the amateur bands only, with band
selection via a knob that moves a large casting containing the
coils for all of the bands. The casting slides back and forth
within the cabinet to bring each bank of coils in contact: sort of
a huge sliding switch as opposed to the more conventional wafer
switches. Tuning uses the classic PW dial as on the the HRO. A
fabulous mechanism with a spirograph-like arrangement of a large
annular gear behind the knob skirt, with the frequency written on
a spur gear that peeks through the knob skirt at five openings.
The frequency is read in numbers from 0 to 500; a chart is needed
to determine the actual frequency received. About as far from a
digital display as you can get.
I would like to trade for a Friden STW or SRW electromechanical
four-function calculator. There is a picture of one at:
http://www.teleport.com/~dgh/srw.jpg
Thanks very much,
Mark Glusker, gl...@sgi.com
located in San Mateo, CA, about 20 miles south of San Francisco