These tubes were used in the 604 Calculator from 1951

Our trainer manual was printed 24th May 1956

The blue transistor is IBM Type 58, Date code 216 = 1956, week 21 = 21st to 27th May 1956



CF-5: Cathode Follower
DS-1: ?
DS-5: ?
IN-1: ?
IN-3: Inverter
IN-5: Inverter
IN-13: Dual Inverter
IN-34: ?
PS-25: Power Switch
TH-1: Thyratron
TR-1: Trigger Flip Flop
TR-4: Trigger Flip Flop
TR-5: Trigger Flip Flop
TR-11: Trigger Flip Flop