Sensibly equivalent¶ to:
An early all glass design of amplifier triode.
The envelope is clearly able to accommodate a pair of these electrode systems. The valve is a thin flat arrangement on one side of the envelope.
This valve was specified for VHF low power transmitter use. The anode dissipation is 7 Watts and the full power frequency rating is 300 MHz. The maximum frequency that useful power could be obtained was 400 MHz. Quite advanced.
As with all valves produced in this method the pins are short and equi-spaced around a circle. The evacuation seal is concealed within a metal spigot that enables the valve to be accurately located within the valveholder.
The valve envelope is 30 mm in diameter and excluding the B9G base pins the valve length is 58 mm.
References: Data-sheet, 1040 & 1043. Type VR137 was first introduced in 1946.
Absolute Maximum Operating Conditions¶
Updated April 04, 2015. shape:wide.glass.tube construction:all.glass type:triode age:1940.1950 base:b9g heater:6.3v pins:9 pin:1.h pin:2.g1 pin:3.k pin:4.a pin:5.nc pin:6.nc pin:7.nc pin:8.nc pin:9.h