STC CV28 / 3J/121E air cooled triode
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.
(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.
This file was last modified
23:10:25, Wednesday February 23, 2022