[Collins] 75A2 / 75A3 mixer modification

[Jim Brannigan]

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