I’m giving a presentation on the Collins 75A-4 receiver this Friday, March 21st, 2014, at the club meeting at the Olathe Community Center. I’ll be bringing the radio and will give a presentation that tells all about it. I made this little video as a teaser—it shows the 75A-4 receiving both CW and SSB on 20-meters.
The 75A-4 fell into my lap many years ago. It’s been sitting in the basement waiting for some tender loving care to bring it back to life. I brought it up last week using a technique Royce Seymour, AAØJD, told me about, and am delighted that every feature works! All 22 tubes seem to be fine, and without my touching any of the alignment, the set brings in signals just fine.
This 1955-era radio was then considered “top of the line” and is still a fine ham-band-only receiver. I brought it up slowly, gradually increasing the voltage, and was delighted to find that after at least 20 years dormant, it works fine! I’m sure a little more tuning will really make it jump.