Most bulbs are new - but sold as used.
Most of these lamps have the Russian inscription RADIUS (РАДИУС).
The measurement parameters correspond to the technical parameters specified by the manufacturer.

Va = 120 V, Vg2 = 120 V, Vf = 6.3 V, Rc = 200 Ohms and la min/max acceptable value = (5 - 9.7) mA.

RUSSIAN TUBES – LAST LETTERS (suffix) MEANING:

V (B) or R (P) - Tubes of special, very high reliability, mechanical strength.

E - Long-life tubes with guaranteed life of more than 5,000 hours.

EV (EB) - Tubes of increased reliability, mechanical strength guaranteed life of more than 5,000 hours.

D (Д) - Extremely durable tubes with guaranteed life of more than 10,000 hours.

DR (ДР) - Tubes of special, very high reliability, mechanical strength, and guaranteed life of more than 10,000 hours.

I (И) - Tubes designed to operate in pulsed mode, characterized by increased emissivity of the cathode.

K - Tubes with high vibration resistance.

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