[Collins] 75A2 / 75A3 mixer modification

[Dr. Gerald N. Johnson]

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