The Peavey CS200, introduced around 1977, was a Commercial Series 200 watt single channel power amp that allowed mixers or amplifiers to drive additional speakers:

Peavey: what every amp would like to be. CS.200 is just one of the range of new Generation Peavey power amps.Send a large stamped addressed envelope for full details of the Peavey range to: PEAVEY ELECTRONICS(UK) LTD 49, THE BROADWAY, HAYWARDS HEATH, SUSSEX. RH16 3AS