Lamp voltmeter `` V3-4 ''.
Instruments for adjusting and controlling the PTA.The V3-4 tube voltmeter has been produced since 1963 by the Punane-RET Tallinn plant. Designed to measure sinusoidal alternating voltages from 0.8 mV to 1 V in the range up to 30 MHz. The device is equipped with a voltage divider that allows you to expand the range of measured voltages up to 100 V.
