Anyone ever heard of a National NC-57 look-alike kit ...

[Greg Gore; WA1KBQ]

National supplied these NC-57's in kit form to  the US military for 
electronics training purposes.

Regards,  Greg

In a message dated 3/19/2009 11:31:04 A.M. Atlantic Standard Time,  
mlangner at SWCP.COM writes:
Hello everyone !

I'm currently checking the  tubes on an NC-57 look-alike.  But the look of
the cabinet is where the  similarity stops.  This receiver is in a cabinet
marked Navy  nomenclature CY 677/U furnished under contract NO bsr 42174. It
is serial  number 939.

The tuning capacitor and bandspread capacitor each are 2  section with both
sections of the two capacitors having identical capacity,  although needless
to say, the bandspread capacitor has much less capacity  than does the main
tuning capacitor.  The two sections of the capacitors  being identical would
appear to make oscillator tracking impossible, which  makes me wonder of this
thing is a TRF. But if it's a TRF, why would it have  a 12SA7?

Tube complement is 12SA7, 12SG7, 12SL7, and a metal 1632 (6F6  like, it
appears) audio output tube.

Front panel controls are: Main  Tuning, Bandspread, AF gain, Pitch,
CW/PHONE/ANL, Bandswitch , Send/Receive.  There is no RF gain control.

Frequency range is .50 to 36  mHz.

Rear panel contains the familiar screw-type balanced/unbalanced  antenna
connector and an SO-239, a round two-pin plug-and-socket that I  suspect is
for connecting an external speaker, and a male (not female)  octal
chassis-mounted socket (plug!).

Next I'll take the bottom off  the unit and peek inside.  The unit does have
a standard brown  2-conductor power cord with a standard American (Edison)
plug on the  cord.

There are two metal cubes atop the chassis that look like IF  transformers.
Two transformers are mounted atop the chassis as well as one  transformer
mounted on the speaker -- audio output tube plate to speaker  transformer.

Several tube sockets are empty.  They have paper  stickers pasted over them
with the words "no tube used here."

A plate  affixed to the top of the chassis by National contains the National
logo, the  words "Receiver Construction Kit", and in smaller print, the  words
"K57B."

Anybody know anything about this interesting  unit?

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