Sensibly equivalent¶ to:
6BQ7A 6H1П-EB 6H1П-EP
The English translation of the Cyrillic 6Н1П is usually given as 6NP1. Н is equivalent to EN and П is equivalent to PE.
This exhibit is a Russian military specification low frequency double triode. It has an electrostatic screen connected to pin 9 and the heaters of each triode are internally connected in parallel. The anode dissipation is 2.2 Watts.
From Wikipedia: No direct western equivalent exists but the 6BQ7A is sensibly equivalent and the 6DJ8 has similar ratings.
Image courtesy of an ebay advert.
The thin glass tube envelope is 22 mm in diameter and, excluding the B9A base pins, is 49 mm tall.
Reference: Datasheet. Type 6N1P was first introduced in 1954.
Absolute Maximum Operating Conditions¶
Updated November 22, 2018. shape:thin.glass.tube construction:all.glass type:double.triode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.a(2) pin:2.g1(2) pin:3.k(2) pin:4.h pin:5.h pin:6.a(1) pin:7.g1(1) pin:8.k(1) pin:9.s