STC CV28 / 3J/121E air
cooled triode
|
This valve measures 340x90mm
overall (50mm across the copper anode), not including the connection straps. |
The data for this valve says that a CV28 with no cooling fins is a
CV1994. However, this valve is labelled as faulty and it is likely
that the fins were never fitted due to this.
Filament voltage (1) |
15.6V |
Filament current |
22A |
Max anode voltage |
10kV |
Max anode dissipation
(2) |
800W |
Mutual conductance (3) |
3.1mA/V |
Anode impedance (3) |
12.5k ohms |
Amplification factor (3) |
40 |
Max total
emission: |
Less than 30MHz |
10kV/400mA |
up to 30MHz |
5kV/400mA |
up to 60MHz |
4kV/400mA |
Capacitances |
Cin nom |
23.2pF |
Cout nom |
1.6pF |
Ca, g1 nom |
15.9pF |
(1) Valves are marked with
the filament voltage which may differ from valve to valve
(2) With forced air cooling
this figure can be 1.1kW
(3) At Va=5kV, Ia=200mA
Connections: The longer strap
leads are the filament. |