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NR53 output beam tetrode

Size
This valve measures 118x45mm overall and has a B7 base

The EVS datasheet for this indicates it can be either a pentode or a beam tetrode. This specimen is a beam tetrode.

Heater voltage4.0V
Heater current1.2A
Max anode voltage250V
Max screen voltage250V
Mutual conductance *2.0mA/V
Max anode dissipation9W

*: At Va=250, Vg2=250, Vg1=-12.5
PinFunction
1n/c
2Control grid
3Screen grid
4Heater
5Heater
6Cathode + beam plates
7Anode

NR53

This file was last modified12:10:34, Sunday February 22, 2015