The KBC32 is a double diode triode for battery operated receivers. This would fit the standard configuration for signal detection, AGC detection and first audio voltage amplifier.
The wide glass tube envelope is 30 mm in diameter, and excluding the IO base pins is 83 mm tall.
References: 1040 & 1043. Type KBC32 was first introduced in 1946.
Absolute Maximum Operating Conditions¶
Updated April 13, 2013. shape:wide.glass.tube construction:pinch type:double.diode.triode age:1940.1950 base:io heater:2.0v pins:8 pin:1.m pin:2.f(+) pin:3.a pin:4.a(d2) pin:5.a(d1) pin:6.- pin:7.f(-) pin:8.- pin:tc.g1