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CV2659 / 3D21 beam tetrode
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This valve measures 118x45mm overall and has an octal base |
This is a beam tetrode intended for pulse modulator or blocking oscillator service
| Heater voltage | 12.6 (series) or 6.3V (parallel) |
| Heater current | 850mA (series) or 1.7A (parallel) |
| Max peak anode current (a) | 5kV |
| Max DC anode voltage (b, c) | 3.5kV |
| Max screen voltage (c) | 850V |
| Max peak negative control grid voltage (a) | 220V |
| Max peak positive control grid voltage | 220V |
| Max anode dissipation | 15W |
| Max screen dissipation | 3W |
| Max control grid dissipation | 500mW |
| Max heater cathode voltage | ±150V |
| Max pulse length (d) | 10µs |
| Anode current (e) | 31.5mA |
| Screen current (e) | 2.5mA |
| Mutual conductance (e) | 5.2mA/V |
| Max acceleration (continuous operation) | 1.0g |
| Max shock (short duration) | 500g |
| Capacitances |
| Cin nom | 17pF |
| Cout nom | 10pF |
| Ca,g1 max | 1.2pF |
(a) including transients
(b) with a max screen voltage of 400V and when no transients are present a max DC anode voltage of 4500V may be applied.
(c) series resistance must be inserted in the power supply to limit the DC short-circuit current to less than 500mA
(d) total pulse length in any 240µs period shall not exceed 12µs
(e) measured at Va=600VDC, Vg2=300VDC, Rk=825 ohms
The valve needs to be mounted vertically
| Pin | Function |
| 1 | Heater centre tap |
| 2 | Heater |
| 3 | n/c |
| 4 | Screen grid |
| 5 | n/c |
| 6 | Control grid |
| 7 | Heater |
| 8 | Cathode |
| TC | Anode |
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