This vacuum photocell has no identification at all. The construction is of a semi-circular photo cathode with a wire frame anode in front but no blocking the light path. In use the anode would be held at a high DC potential through a large value resistor.The electrodes side view.The rear of the cathode.The wide glass tube envelope is 25 mm in diameter, and excluding the B4 base pins is 88 mm tall.Reference: Observation. |
Updated February 11, 2013.
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