Summary

Two electronic valves, Miniwatt Type 12AX7, manufactured by Philips in original packaging. Used as a spare parts for the MUDPAC analogue computer. These valves were used in the second stage of the operational amplifier modules and in the integrator modules, they may also have been used in the power supply.

Physical Description

Tubular glass bulb with exhaust tip on top with standard nine pin miniature base. Cardboard box with yellow glossy background and blue band; red, blue, black and white printed text. Philips corporate symbol. Illustration of an electronic valve. Extensive list of numbers printed on the inside of the box.

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