Sensibly equivalent¶ to:
The 6R7 double diode triode was designed for radio receiver use. In the classic superhet broadcast receiver such a valve would provide signal and AGC rectification, followed by the first audio amplification.
The control grid of the triode was taken to the top cap. The cap is fitted to an insulating disc that is clamped to the envelope by rolling over the top of the metal tube.
The thin metal tube envelope is 25 mm in diameter, and excluding the IO base pins, is 63 mm tall.
References: Datasheet, 1040 & 1043. Type 6R7 was first introduced in 1936.
Absolute Maximum Operating Conditions¶
Updated January 26, 2013. shape:thin.metal.tube construction:pinch type:double.diode.triode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.a(d2) pin:5.a(d1) pin:6.- pin:7.h pin:8.k pin:tc.g1