CV1221 / NT38A transmitting pentode
 |
This valve measures 248x63mm overall and has a 4 pin T4 base |
| Filament voltage | 10V |
| Filament current | 2A |
| Max anode voltage | 1500V |
| Max screen voltage | 500V |
| Max anode current * | 150mA |
| Total cathode current * | 200mA |
| Mutual conductance ** | 1.7mA/V |
| Continuous anode dissipation | 75W |
| Screen dissipation | 20W |
| Capacitances | |
| Caf | 20pF |
| Cgf | 26pF |
| Cag | 0.05pF |
*: These values apply for use of the valve as an unmodulated Class C amplifier
at not less than 15 metres wavelength
**: At Va=1500, Vg2=400, Ia=60mA
Pins: base view, clockwise from the index pin: screen grid, filament, control grid, filament. The base shell is the suppressor grid connection and the top cap the anode.
