vintagecalculators
Calculator Electronics - Integrated Circuits - Vintage Calculators
... it were not taken by the British distributor, Sumlock Comptometer Ltd., until January 1st 1962. ... 10 vacuum tubes (thermionic valves) of type ECC81. 1 transistor of type Ferranti ZT42. A pulse rate of 4 KHz is used by the electronics. ... The timer boards indicated in the photograph above are used to control various aspects ...
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