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ECC83 / 12AX7 / CV492 double triode


Size This valve measures 55x20mm overall and has a B9A base.

See also CV4004 and the fly lead version CV4035 which are based on this valve.

Heater voltage 12.6V / 6.3V
Heater current 0.15 / 0.3A
Anode voltage 250V
Grid voltage -2V
Anode current 1.2mA
Mutual conductance 1.6mA/V
Ampification factor 100
Max anode dissipation 1W
Cag1 1.7pF
Cin 1.6pF
Cout 0.4pF


Pin Function
1 Anode 1
2 Grid 1
3 Cathode 1
4 Heater
5 Heater
6 Anode 2
7 Grid 2
8 Cathode 2
9 Heater centre tap
Variations in design: from left to right, Mullard British made, Mazda marked Foreign, imported Mullard, Brimar (12AX7 marked) made in England, and Pinnacle ECC83/12AX7 marked.