Sensibly equivalent¶ to:
The EF97 is a variable μ RF and IF pentode for use in car radios. Note the very low anode voltage compared with previous generations of car radio valves that used a vibrator fed HT transformer.
The EF97 was introduced in 1959 just a few years before transistor car radios took the market.
The side view is no clearer than the front as the electrodes are obscured by the screen and gettering.
The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 47 mm tall.
References: Datasheet, 1040. Type EF97 was first introduced in 1959.
Absolute Maximum Operating Conditions¶
Updated February 08, 2013. shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.k.s pin:3.h pin:4.h pin:5.a pin:6.g2 pin:7.g3