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CV5948 triode pentode

Size This valve measures 54x19mm overall and has a B9A base.

This valve is an ECF804.

Heater voltage6.3V
Heater current450mA
Pentode section
Anode voltage150V
Screen voltage150V
Control grid voltage-2V
Anode current7mA
Screen current2.2mA
Anode impedance350k ohms
Mutual conductance11mA/V
Triode section
Anode voltage150V
Control grid voltage-1.5V
Anode current13.5mA
Anode impedance5300 ohms
Mutual conductance7.2mA/V
Cgk (pentode)7.0pF
Cak (pentode)3.1pF
Cga (pentode)0.02pF
Cgk (triode)2.5pF
Cak (triode)1.5pF
Cga (triode)1.8pF


1Triode anode
2Pentode control grid
3Screen grid
6Pentode anode
7Pentode cathode + suppressor grid
8Triode cathode
9Triode grid

This file was last modified 23:10:34, Wednesday February 23, 2022