Soviet electron tube 6J9P (6Zh9P) - HF pentode with a steep characteristic, used in the input stages of broadband amplifiers. Equivalent to E180F, 6688
Russian tube 6J11P-E (6Zh11P-E) HF pentode with a short anode-grid characteristic of increased durability, reliability and mechanical strength. Equivalent E180F, 6688
Low-frequency output tetrode 6P1P-EV tube. Great sounding! Near equivalent: EL82, and similar to the 6AQ5, EL90, 6V6. Different pin out (9-pin base versus 7-pin base) than an 6AQ5 / EL90
6J1P-EV tube HF pentode with a short anode-grid characteristic of increased durability, reliability and mechanical strength. Analog 6AK5, EF95, EF95F, EF905, 6F32