Sensibly equivalent¶ to:
The Pen383 is a beam tetrode audio output valve on a Mazda Octal base that was designed for receivers operating without an isolating mains transformer. The design was released in 1938 with other valves to build superhet receivers. The Pen383 could produce just under three Watts of audio.
The identification is located on the top of the valve. The control grid has heat radiating fins at the top. The bright rod across the top is the cathode connection. The suppressor grid also connects to this cross bar.
The classic envelope is 54 mm in diameter, and excluding the MO base pins is 103 mm tall.
References: datasheet & 1043 Type Pen383 was first introduced in 1938.
Absolute Maximum Operating Conditions¶
Updated January 26, 2018. shape:classic construction:pinch type:beam.tetrode age:1930.1940 base:mo heater:200ma pins:8 pin:1.h pin:2.k pin:3.a pin:4.g2 pin:5.g1 pin:6.m pin:7.- pin:8.h