Sensibly equivalent¶ to:
The VR137 was specified for VHF low power transmitter use and the commercial name is EC52. 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.
The envelope is clearly able to accommodate a pair of these small electrode systems. The valve is a thin flat arrangement on one side of the envelope.
As with all valves produced in the early days of the glass disc base 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 wide glass tube envelope is 30 mm in diameter and, excluding the B9G base pins, is 58 mm tall.
References: Datasheet, 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