[Boatanchors] Mystery National Receiver, NC-127D

[rkerr]

On a first look inside the NC-127D, the receiver does appear to be a mod 
of a standard product.  Directly behind the front panel is a  3 section 
variable capacitor with a 6K7 (RF amp), 6L7 (mixer) and 6J5 (osc) 
positioned by their respective sections.  However, the capacitor shaft 
extends into an add-on shielded box where there is apparently another 
capacitor section with another 6K7 RF amplifier.  Everything is covered 
with yellow-green antifungal agent and very well preserved.

I can email pictures to anyone interested.

Bob
WB4TGG

WA5CAB at cs.com wrote:

> Bob & Group,
>
> I have a manual here that came out of the National plant after they 
> went out of business (the front cover is stamped "File Copy").  Title 
> is "Instruction Manual for Experimental Model NC-127D Diversity 
> Receiving Equipment".  The manual is pretty thin and doesn't exactly 
> match your radio as neither the schematic nor the line drawing of the 
> front panel show an S-meter.  No date that I can find.  The receiver 
> covered by this manual is single-conversion and uses double-ended 
> tubes in the RF's, mixer and IF's (6K7's, 6J7 and 6K7's).  6J5 HFO.  
> 6V6 output.  The Diversity Gain pot controls the 1st IF and the text 
> says that it is for balancing the gains of multiple receivers.
>
> And BTW, it's "haze gray".  Hence the sailor's lament, "haze gray and 
> under way".  :-)
>
> In a message dated 6/29/2004 10:21:42 AM Central Daylight Time, 
> robert.kerr at gtri.gatech.edu writes:
>
>> I have an interesting old National receiver with no documentation,
>> labeled model number NC-127D.  It appears very similar to the NC-101XA,
>> but it's painted battleship gray and has a rack mount front panel with
>> handles.  There are more control knobs on the front panel than the
>> -101XA, and the S-meter is located at the upper left corner of the front
>> panel, rather than behind the near left side of the tuning dial
>> escutcheon as in the -101XA.  It tunes from 540 kHz to 30 MHz.  The
>> knobs are an off white color.
>>
>> A tag on the front says "Order number 2507" and gives a manufacturing
>> date of 6-1-45.  The serial number is "1".  I have it from the former
>> owner that the "D" stands for diversity, and that it was designed to be
>> part of a diversity reception system employing at least one other
>> receiver like it.  There is a coax connection on the back for
>> import/export of the local oscillator signal, but unfortunately I have
>> only one radio.
>>
>> Does anyone out there know anything about this radio?
>
>
>
> 73
> Robert Downs - Houston
> <http://www.wa5cab.com> (Web Store)
> <wa5cab at cs.com> (Primary email)
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