[Collins] Universal Service Co. Product detector

[C Eus]

I think ER has an article about this item too...but
the date escapes me. Cal. 
--- Jim Brannigan <jbrannig at optonline.net> wrote:

> Al,
> Much of this is from memory.
> The detector dates from the mid to late 50's.  I
> built a similar device for
> my long gone 75A3.
> The unit sits vertically in the FM socket of the
> 75A.  It contains a product
> detector and BFO.
> It is in circuit in the FM position.  There should
> be a shaft for tuning the
> BFO.  The shaft extends through the front panel in
> place of the Collins
> emblem.
> 
> A search of 50's QST will have ads and schematics
> that are very similar to
> Universal's.
> I believe they used the "Crosley" circuit.
> 
> If all this is wrong, I blame it on a "senior
> moment" and take no
> responsibility. ;~)
> 
> Jim
> 
> > Just recently acquired a non-working 75A2 equipped
> with this commercial
> > product detector model A2-3.
> > Would anyone on the list have any
> information/schematic for the unit,
> > and how it operates with the receiver.
> > Thanks,
> >
> > Al Santangelo  VE3 AJM
> 
>
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> 


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