CV257 triode
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This valve measures 125x60mm overall |
This is a disc seal triode intended for pulse operation. It's serial number is 2504. In pulse mode a pair of CV257 valves could produce 10kW RF at 600MHz.
| Heater voltage | 6.3V |
| Heater current | 4A |
| Max DC anode voltage | 600V |
| Max pulse anode voltage | 4kV |
| Max anode dissipation * | 75W |
| Min peak emission | 15A |
| Amplification factor ** | 22 |
| Mutual conductance ** | 20mA/V |
| Efficiency at 500MHz with 11db gain | 60% |
| Efficiency at 1GHz with 8db gain | 40% |
| Capacitances | |
| Cag | 6.5pF |
| Ckg | 10.5pF |
| Cak | 0.3pF |
*: At ambient temperatures of 30°C forced air cooling of greater than 5 cubic feet per minute with a pressure drop equivalent to 2" of water is required.
**: At Va=500V, Ia=100mA
In the image above, the heater connection is leftmost, with the heater/cathode connection being the first disc. The grid is the next disc and the anode the far end. The anode connector has an internal radiator (see below).
