Design Details
The AN/PVS-4 uses a 25mm screw-type variable-gain Image Intensifier tube. Power is supplied by a single 2.7 volt mercury battery, type:BA-1567/U, BA-5567/U or BA-3058/U although two can be connected. The AN/PVS-4A uses two common AA batteries in a housing designed to fit the AN/PVS-4. AN/PVS-4s still in use today are typically upgraded to AA batteries even if they have not been upgraded to a third generation tube.
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