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CV1581 / VR99A / 10E/757 triode/hexode

Size This valve measures 106x35mm overall and has an octal base.

This is an unmetallised version of the ECH35.

Heater voltage 6.3V
Heater current 300mA
Hexode section
Max anode voltage 300V
Max screen voltage 100V
Max anode dissipation 1.2W
Anode current (see note A) 2.2mA
Conversion conductance (see note A) 650µA/V
Triode section
Max anode voltage 150V
Max anode dissipation 1.5W
Hexode Cag 0.0035pF
Hexode Cae 10.0pF
Hexode Cge 4.8pF
Triode Cge 8.4pF

(Data from ECH35)

A: Measured at Va=300V, Vg2/4=100V, Vg1=-4V, Vao=150V, Vgo=-3V

Pin Function
1 n/c
2 Heater
3 Hexode anode
4 Screen grid (G2, 4)
5 Oscillator grid (G0, 3)
6 Oscillator anode (A0)
7 Heater
8 Cathode
TC Signal grid (G1)



This file was last modified 23:10:40, Wednesday February 23, 2022