Sensibly equivalent¶ to:
The AC/DDTR is a double diode triode for detection and first AF amplifier in superhet receivers. It was an cost saving to make all three devices in a single envelope with a common cathode. This style became the normal configuration. This valve is specified for a cathode resistor of 1kΩ.
The classic envelope is 36 mm in diameter and, excluding the B7 base pins, is 96 mm tall.
References: Datasheet & 1043.
Absolute Maximum Operating Conditions¶
Updated December14, 2012. shape:classic construction:pinch type:double.diode.triode age:1930.1940 base:b7 heater:4.0v pins:7 pin:1.a(d2) pin:2.m pin:3.a(d1) pin:4.h pin:5.h pin:6.k pin:7.a pin:tc.g1