[Collins] 75A2 / 75A3 mixer modification

[C E]

Jim:
What is your take on the modification? Good, bad, or
ugly? 

Cal,N6KYR/8

--- Jim Brannigan <jbrannig at optonline.net> wrote:

> I changed both mixers in a 75A3 many moons ago, 
> 
> QST 56,57,58?
> 
> Jim
> 
> 
> > On Mon, 2006-06-26 at 18:56 -0700, Glen Zook
> wrote:
> >> I had an inquiry about a 75A3 that has had the
> first
> >> mixer changed out from the 6BA7 to a 12AT7. 
> Since I
> >> had not seen this change before I thought that I
> would
> >> see if anyone had any information on the
> modification
> >> so that I could pass along the information.
> >> 
> >> Of course the same modification would work on the
> 75A2.
> >> 
> >> Glen, K9STH
> >> 
> > I think that was published in an early 73
> magazine, though it could have
> > been a 50s vintage CQ that is in my collection.
> The 12AT7 has far lower
> > noise but also lower gain. It may take days to
> find the article, but I
> > recall it being published.
> > -- 
> > 73, Jerry, K0CQ, Technical Advisor to the CRA
> > All content copyright Dr. Gerald N. Johnson,
> electrical engineer
> 
>
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