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CV1056 / NR49 / VR56 / 10E/11402 pentode

VR56 size The valve measures 98x28mm overall and has an octal base. G1 is the top cap.


Heater voltage 6.3V
Heater current 200mA
Max anode voltage 300V
Max screen voltage 125V
Max anode dissipation 1W
Max screen dissipation 0.3W
Mutual conductance
Anode impedance 2.5 M ohms
Amplification factor 4500
Max operating frequency 125MHz
Cae 8.2pF
Cge 5.5pF
Cg1-g2 2.25pF
Cag (max) 0.003pF


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


VR56 box


CV1056 NR49

Mullard NR49. The valve carries the markings Admiralty Patt. 1260, and the serial number 1445 on the base.

Top quarter view

Bottom quarter view


Thanks to Chris Colebrook for donating the VR56

This file was last modified 15:25:23, Tuesday September 02, 2014