[Jayce]

My 1962 RCA has the center channel on it as well. Also, it was made for an optional FM multiplex or you could run both AM and FM together to try for stereo. The amp in mine uses three 6BQ5's in it. One for each channel and the third for a bass channel. Today I am fussing with taking those two Silvertone 7407 units and making one good one. Now those have four 6BQ5 tubes so it has push-pull on each side. They are are real thumpers with the matched speakers!