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NR61 / W42 Vari-µ screen pentode

Size This valve measures 119x40mm overall and has a B7 base.

This valve also carries the Admiralty Pattern number W265 and the code ZOSJ.

Heater voltage 4V
Heater current 600mA
Max anode voltage 250V
Max screen voltage 125V
Mutual conductance (Va=250, Vg2=125, Vg3=0, Vg=-3) 1.5mA/V


Pin Function
1 n/c
2 Anode
3 Suppressor grid
4 Heater
5 Heater
6 Cathode
7 Screen grid
TC Control grid


W42 label

This file was last modified 15:10:14, Tuesday September 02, 2014