Sensibly equivalent¶ to:
The DF33 is a variable μ RF pentode for dry battery operation. Mullard designate this device for service at both RF and IF in broadcast receivers. It was part of the 'red series' of valves that were first introduced in 1938.
The relatively large size of the valve suggests that it was not designed for battery portable sets but for fixed operation. The filaments had to have the lowest possible consumption due to the cost of the dry batteries.
We also have the DF33 with a metal skirt between the IO base and the envelope.
The wide glass tube envelope is 28 mm in diameter, and excluding the IO base pins is 81 mm tall.
References: Data-sheet, 3002 & 1040. Type DF33 was first introduced in 1939.
Absolute Maximum Operating Conditions¶
Updated February 15, 2013. shape:wide.glass.tube construction:pinch type:pentode age:1930.1940 base:io heater:1.4v pins:8 pin:1.m pin:2.f+ pin:3.a pin:4.g2 pin:5.- pin:6.- pin:7.f- pin:8.- pin:tc.g1