Sensibly equivalent¶ to:
The Mullard DK32 is a heptode frequency changer designed for battery superhet radio receiver use.
As a frequency changer, the local oscillator is formed between the cathode and grid 2. Grid 1 being the oscillator control grid. The pulsating electron flow is screened by Grid 3 from the oscillator and grid 5 from the anode. In this screened space is the mixer control grid g4. For maximum isolation between oscillator and signal circuits the mixer control grid is taken to the top cap.
The reverse is plain red metal screening paint.
The wide glass tube envelope is 30 mm in diameter, and excluding the IO base pins is 86 mm tall.
References: Datasheet, 1040 & 1043. Type DK32 was first introduced in 1945.
Absolute Maximum Operating Conditions¶
Updated January 12, 2016. shape:wide.glass.tube construction:pinch type:heptode age:1940.1950 base:io heater:1.4v pins:8 pin:1.s pin:2.f+ pin:3.a pin:4.g3.g5 pin:5.g1 pin:6.g2 pin:7.f- pin:8.- pin:tc.g4