[Collins] 75A3 accessory?

[Jim Brannigan]

I found the name of a commercial vendor for the product detector, Universal
Service Co.  There is a an item in hints and kinks QST, April 1958.
QST view does not have a search feature for advertisements.  I think CQ had
additional information.
Jim


> Typo on my part. The tube is a 12AU7A. Twin triode.
>
> It's definitely a commercial construction. No markings, though.
>
> What I would be trying to get the schematic for is how to (re)wire the
> 75A3 for the
> mod though I can probably figure that out too. There are some number
> of late revisions to the circuitry.
>
> Is there a listing somewhere of official Collins mods for the A3?
>
>
> ----- Original Message -----
> From: "Darrell & Kay Brooks" <wa5vgo@earthlink.net>
> To: "Guy Olinger, K2AV" <k2av@contesting.com>; "Collins2 LIST"
> <collins@mailman.qth.net>
> Sent: Sunday, March 24, 2002 10:22 AM
> Subject: Re: [Collins] 75A3 accessory?
>
>
> > Are you sure it's not a 12AU7? That was a very common product
> detector
> > modification. Basically it amounted to building a 75A4 detector in
> the
> > receiver.
> >
> > Regards,
> > Darrell, WA5VGO
> >
> >
> >
> >
> > >The adapter I have has a single 12AU6A on top of an IF can that
> > >presumably holds circuitry.
> >
> >
>
>
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