Russian tube G-807 output beam tetrode. Brown base. Great vintage sound! Analog to the 807 Sylvania, VT-100, QE06/50. Near equivalent: 6BG6G, 1625 and 5933
Soviet electron tube 6P1P-EV - low-frequency output tetrode. 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
Russian tube 6P3S-E REFLECTOR factory, output beam tetrode. Best quality, the sound is nice - authentic vintage tone. Near equivalent: 6L6, 6L6GT, 6L6GC and 5881
Low-frequency output tetrode 6P1P 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
Russian tube 6P3S FOTON factory, output beam tetrode. Best quality, the sound is nice - authentic vintage tone. Near equivalent: 6L6, 6L6GT, 6L6GC and 5881
Russian GU-39B-1 powerful generator tetrode tube. Power amplifier of HF oscillations at frequencies up to 100MHz with an output power of more than 13kW