[NJARC] Double-Conversion Stewart Warner

[Ray Chase]

Yes the BC band was limited to 1500 kc in those days.  Interesting 
sounding set, I'll have to look it up in Riders.  Do not have any 
further info on it at this time.
Ray

Al Klase wrote:

> I'm currently restoring a Stewart Warner "Duo
> Super-Heterodyne" Model 105 from the early 1930's.  See
> Rider's Volumn III.  Yes, it is double-conversion on the
> three short-wave bands.  On the broadcast band, the tube
> lineup is 58 tuned RF amp., 58 mixer, 56 osc, 58 177.5KC IF,
> 27 det, 57 AVC, and PP 47's.  On the shortwave bands, the
> normal tuning ganged capacitors are disconnected in favor of
> trimmers that tune the broadcast section to 1525KC, and an
> additional type 57 mixer and 56 oscillator function as a
> tunable converter controlled by a 4th and 5th section of the
> main tuning capacitor.  (I've had to move the first IF to
> about 1590 to avoid WKBW.  Was the broadcast band limited to
> 1500KC in those days?)
> 
> Can anyone point me to historical info on this set,
> production date, magazine articles, etc?  Was this the first
> double-conversion radio offered to the public?  Were there
> any others in the pre-war era?
> 
> Thanks,
> Al
>