09-06-2018, 10:06 PM
Hi John, here's a picture of the socket connection to my ARBE III that I use to run mu 38-643B & 37-38B radios that I have in my collection. I couldn't find my 37-623 service data but located my 37-643 service data which also covers the 38-643 chassis and took a pic of the battery connector which shows the voltages. For the -3 volts I used the -4.5 volt connection on the ARBE III and it works fine. Thanks, Ken