Sensibly equivalent¶ to:
Mullard describe the E810F as a special quality high slope pentode designed for use in industrial equipment where stability of characteristics and long life are required. It is a wideband RF device, but no frequency range is given. From the information available it appears that 40 - 100 MHz is a probable upper value. Oscilloscope amplifiers and other measuring instruments are likely candidates for this valve.
The anode side view.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins, is 47 mm tall.
References: Data-sheet & 1040. Type E810F was first introduced in 1968.
Absolute Maximum Operating Conditions¶
Updated February 21, 2014. shape:thin.glass.tube construction:all.glass type:pentode age:1960.1975 base:b9a heater:6.3v pins:9 pin:1.k pin:2.g1 pin:3.k pin:4.h pin:5.h pin:6.g2 pin:7.a pin:8.g3.s pin:9.g2