The Collins 75A-4 Handbook

The 2025 edition of our Collins 75A-4 Handbook now includes J.B. Jenkins’ (W5EU, SK) important article on the original 75A receiver that was overlooked in the first edition, plus correction of a few typos. It is a 257 page, professionally printed and bound book 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 thirty-six 75A-4 articles printed in Electric Radio since 1989, some of which are out-of-print in the back issues. Some pages are now in full color.

The book highlights the history and development of the 75A-series of receivers that began in Iowa during 1946 with the 75A 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 evolved into the 75A-4 with interviews from legendary radio engineers such as Gene Senti and Roy Olson (Mr. Olson was the A-Line designer). These engineers are no longer with us.

It has all the articles in CQ, Ham Radio, and QST over the last 66 years.

A special section explains the low-noise, dual-triode receiver mixer, commonly called a “Pullen mixer” with information on its designer, Keats Pullen, including his original mixer documents.

Another special section details component identification in the 75A-4 so that repairs can be made efficiently.

It includes a rare Collins document from 1957, TM-303-9, “Production Test Procedure for 75A-4 Amateur Receiver” by George Stevens (WØATA, SK), a retired Collins test engineer.

Books are always sent in new boxes to avoid shipping damage.