Russian 6C4P-EV kenotron tube, two-anode. Designed for rectification of alternating current of industrial frequency 50Hz. Equivalent: 6Z4, EZ90, 6Z31, SV4005
Russian electron tube 6P14P-EV low-frequency output pentode. Great sounding, high quality! Full analog: EL84, 6BQ5. Near equivalent: 7320, 7189, 7189A, 6P15, 6L40 Tesla, N709
Russian tube 6P3S output beam tetrode. Best quality, authentic vintage tone output tube for guitar & hi-fi amps. Near equivalent: 6L6, 6L6GT, 6L6GC and 5881. Manufacturer: FOTON / NOS
Russian tetrode tube GU-74B are direct replacements for use in some of the best-built RF power amplifiers, including Alpha 99, 91B, 8100; ACOM 1000, 1006, 1010, 2000A. Fully equivalent to the modern 4CX800A tube