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12SC7 Double triode, verschillende merken
The 12SC7 is a metal enveloped double triode, these valves have been used in guitar amplifiers and the ECC83 is used for upgrades.
We also have the 6SC7 that differs only in heater rating.
The thin metal tube envelope is 25 mm in diameter, and excluding the IO base pins is 51 mm tall.
The 12SC7 was first introduced in 1939.