I am very happy today. Finally found out how to make these amps work. These are Securicor ACSB amps that were made by E.F. Johnson. EFJ model number is 023-1220-045. I have been looking for the info on these for a couple of years with no luck. Finally found it at the KE3JP / R webpage, a BIG thank you to them. Put + 5 v. on pin 8 of the DB9, drive with about 20 mw, and I get appx 120 watts out. Posting this in case anyone else has been looking for the info like I have.
