[radiotvnut]

According to the schematic, the amp chassis contains two 6V6's in PP to drive the center channel and these are driven by a 12AX7 on the main amp chassis. There is a 6BQ5 for the L channel and another 6BQ5 for the R channel, both being driven by a 12AX7 that's hiding on the preamp chassis that contains the volume, balance, bass, and treble controls. There was also a version of this console that contained an AM/FM radio.