Some Factory-Built Remote Mixers

Collins 12Z   Gates GR90
LEFT:  Collins 12Z;   RIGHT: Gates GR-90

Raytheon   RCA op7
LEFT:  Raytheon RR-30;   RIGHT:  RCA OP-7

Western Electric  RCA BN-16

LEFT:  Western Electric  22D;  CENTER:  Collins 212Y;  RIGHT:  RCA BN-16 (Author's collection)


www.theradiohistorian.org