Sensibly equivalent¶ to:
The 6R7G 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 6SR7 has the same rating but is in a single ended metal envelope.
The classic envelope is 36 mm in diameter, and excluding the IO base pins, is 94 mm tall.
References: Datasheet, 1040 & 1043. Type 6R7G was first introduced in 1936.
Absolute Maximum Operating Conditions¶
Updated February 02, 2013. shape:classic 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