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Vintage soviet double diode – triode 12G1 (12Г1) is a direct replacement for the american 12SR7. The 12G1 differs only in heater voltage (12,6V) from the 6G1 (6,3V). Tubes were made in Foton, Tashkent (Uzbekistan) factory in year 1960. New in box and tested (please look at the gallery pictures).