Sensibly equivalent¶ to:
The Mullard CBL31 dates from 1938 and was designed for low cost superhet broadcast receivers mainly for local station use. The diodes function as AGC rectifier and signal detector (demodulator of AM signals) whilst the high gain pentode amplifies the detected signal and drives the loud speaker.
The anode, although not clear, has side flanges that radiate heat and attach to the supports the enclosed space is oval in shape.
The classic envelope is 44 mm in diameter, and excluding the IO base pins is 119 mm tall.
References: Datasheet & 1043. Type CBL31 was first introduced in 1938.
Absolute Maximum Operating Conditions¶
Updated December01, 2012. shape:classic construction:pinch type:double.diode.pentode age:1930.1940 base:io heater:200ma pins:8 pin:1.m pin:2.h pin:3.a pin:4.a(d2) pin:5.a(d1) pin:6.g2 pin:7.h pin:8.k pin:tc.g1