I am looking for an online source for several articles relative
to the 51J series of receivers:
(1) April 1961 CQ - "The Single Tube Product Detector"
(2) April 1968 CQ - "Further Improvements for the 51J"
(3) December 1968 CQ - "More On Updated Improvements for
the 51J Receivers"
Anybody out there in Collins land know where I can obtain these?
Thanks & 73,
Michael