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Mullard ECC33 / CV2821 double triode

Size This valve measures 82x31mm overall and has an octal base.

This is a high slope, low impedance double triode primarily intended for use in flip-flop scaling and computer circuits.

Heater voltage 6.3V
Heater current 400mA
Max anode voltage, Ia=0 500V
Max anode voltage 300V
Max anode dissipation 2x 2.5W
Max cathode current 2x 20mA


Pin Function
1 Grid 1
2 Anode 1
3 Cathode 1
4 Grid 2
5 Anode 2
6 Cathode 2
7 Heater
8 Heater
ECC33 / CV2821

This file was last modified 23:10:39, Wednesday February 23, 2022