SCAN TAKEN FROM 1974 SELMER ELECTRONICS CATALOGUE:
PA 100 Amplifier Head mounted on a Selmer PA 60H speaker cabinet. This cabinet enclosed 3 x 12" speakers plus horn. Two PA 60H units were recommended for use with the PA100 amplifier.
COURTESY OF JOHN INNES, SCOTLAND:
Serial No. 75162
Note the "Point to Point Wiring" used - no sign of any PCB's here!