[Boatanchors] HRO product detector

[Sandy]

I'd imagine the National NC-183D version (if there is one) is identical to 
the HRO-60 version.  I got a Product Detector built for an NC-183D I owned 
for a while and it worked pretty well.  It used a 6BE6 tube.  I got rid of 
the NC-183D primarily because the "converter" stage "pulled" in frequency 
and this was very annoying at time on the higher bands especially.  Think it 
was a serious design flaw that they didn't provide a seperate oscillator 
stage for the NC-183D!

73,

Sandy W5TVW

----- Original Message ----- 
From: "Singley, Rodger" <rbsingl at ilstu.edu>
To: <boatanchors at mailman.qth.net>
Sent: Wednesday, February 03, 2010 5:27 PM
Subject: [Boatanchors] HRO product detector


> List members,
>
> I picked up an HRO-60 with a plug in product detector and I wonder if 
> anyone has information on it.  A google search has not yielded anything 
> useful.
>
> The unit plugs into the NBFM socket and is commercially made.  It is built 
> in a copper box upon which is printed:  HRO PRODUCT DETECTOR  Universal 
> Service Co.  114 N. 3rd ST.  Columbus Ohio
>
> It uses 6BA6 and 12AT7 tubes and on the end of the panel visible when it 
> is plugged in is a variable control allowing selection of upper and lower 
> sideband.
>
> It looks well made and I would like to know more of the history if anyone 
> knows.
>
> Thanks!
>
> Rodger WQ9E
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