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NR51 vari-mu HF pentode

Size This valve measures 130x43mm overall and has a B7 base.

This valve carries the serial number 7593C (but 7592C on the box), and has Adm Patt 1166 on the base.

Heater voltage 4V
Heater current 1.2A
Anode voltage 200V
Screen voltage 100V
Mutual conductance (Va=200, Vg2=100, Vg1=-2) 2.5mA/V
Ca,g1 (max) 0.006pF
Cin 12.5pF
Cout 10.2pF


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



This file was last modified 15:18:06, Tuesday September 02, 2014