These tubes are similar to ECC83 and 12AX7 but NOT direct replacement.!!!

     6N2P-EV=12AX7= ECC83 Russian Tubes OTK/SILVER SHIELD/GOLD GRID /TESTED! YEAR 84-85

                                             QTY-4

  6N2P-EV could be used as a replacement for ECC83 and its equivalents, but only respecting some conditions about heating connections, please consult datasheet or ask us before buying for this purpose.

                                                                                                                                                                   
                                                            Military quality check passed (rhombus).
                                                            OTK (quality control) passed. 

                                      The tubes are never used. Old stock.

    Russian Dual Triode Tubes

It is new, old stock tubes.

Military <rhhombus>and <OTK> mark

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.