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6N13S
Soviet double triode 6N13S tube, low resistance, strong signal amplification. Great sound detail! Manufacturer: SVETLANA. Equivalent to the 6AS7G , ECC230, 6N5S.
6N13S / 6N5S Datasheet.pdf
6J32P (original box)
GU-74B (original box)
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
GU-74B / 4CX800A Datasheet.pdf