The UF80 high slope, screened amplifier pentode is designed for voltage amplifier applications. Probably for use at 10.7 MHz for FM radio receivers. The UF80 was seen in radio receiver valve line-ups in the 1950s.
The low anode voltage and 100 mA heater requirement point to use in applications without mains transformers.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins the valve is 58 mm tall.
References: Datasheet & 1040. Type UF80 was first introduced in 1953.
Absolute Maximum Operating Conditions¶
Updated January 28, 2013. shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b9a heater:100ma pins:9 pin:1.k pin:2.g1 pin:3.k pin:4.h pin:5.h pin:6.s pin:7.a pin:8.g2 pin:9.g3