The 6GF5 from the American GE company is a high voltage beam pentode with a nine Watt anode dissipation. Close inspection reveals a beam tetrode structure with two connections to the control grid. The 6GF5 was used in the Tektronix 556 oscilloscope mainframe.
The valve is from the GE Compactron family of valves introduced in 1961. This series of valves comprised both multiple valves in a single envelope or high voltage devices such as the 6GF5. The series features a 12 pin base with the seal in the centre of the base and not at the top as was common with other miniature valves.
The dome shows the type designation and also the tops of the grid supports held in the top mica. The heater passes through the rectangular cathode four times.
The wide glass tube envelope is 29 mm in diameter and, excluding the 12 base pins, is 60 mm tall.
Reference: Datasheet. Type 6GF5 was first introduced in 1961.
Absolute Maximum Operating Conditions¶
PDF scanned from an original document held by the museum
Updated May 03, 2014. shape:compactron construction:all.glass type:pentode age:1960.1975 base:b12c heater:6.3v pins:12 pin:1.h pin:2.g2 pin:3.g1 pin:4.k.g3 pin:5.ic pin:6.ic pin:7.a pin:8.ic pin:9.ic pin:10.k.g3 pin:11.g1 pin:12.h