I am in the process of bringing a BC-348M< back to life. Is it correct that pins 2 & 6 are the receiver muting when paired with a transmitter? It appears I need to short them together to provide B+ for some of the tube screens. It also appears I have a short (probably a cap) on pin#2 somewhere in the chain. Thank You Tom Elmore KA1NVZ Anchorage, Alaska