The Collins 75A-4 Handbook: This is a newly revised and expanded book produced by Electric Radio, formerly titled the “75A-4 Modification Compendium.” It is now a 234-page bound volume with a soft cover, having all the factory service bulletins from the Collins Radio Company and Collins Addendum info not in the service bulletins. It Includes all-new articles never published in Electric Radio, plus all 33 75A-4 articles printed in Electric Radio since 1989, some of which are out-of-print in the back issues.
This expanded version highlights the history and development of the 75A-series of receivers that began in 1946 at the Collins Radio Company, eventually leading to the famous Collins 75A-4 receiver, as documented in many articles over the years in Electric Radio magazine. These articles discuss the background that lead to the 75A-4 with interviews from legendary radio engineers such as Gene Senti and Roy Olson that designed the A-Line. These engineers are no longer with us. It has all the articles CQ, Ham Radio, and QST over the last 50+ years, now 234 pages, many in color.
A special section explains the cathode-coupled, dual-triode receiver mixer, commonly called a “Pullen Mixer,” with information on Keats Pullen with his original mixer documents. Another special section details component identification in the 75A-4 so that repairs can be made efficiently.
It has been updated during June 2013 with a rare Collins document TM-303-9, “Production Test Procedure for 75A-4 Amateur Receiver,” as revised October 2001 by George Stevens, WØATA, a retired Collins test engineer, plus other articles never published in Electric Radio. Many pages are now in full color.