12sr7 triode, double diode, manufactured by RCA, Harrison, NJ, USA. The diodes in this valve were designed for use as the signal detector and automatic gain control rectifier in radio receivers, the low mu triode section was designed to be used as the audio amplifier following the detector. Equivalent to the 6SR7 except for the heater voltage of 6SR7 is 6 volt.

12.6 volt indirectly heated cathode at 150 ma. mutual conductance 1900. Amplification factor 16.

Physical Description

Base type: octal No. of pins in base: 8 Bulb shape: cylindrical Bulb material: metal Looks unused

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