CV2158 thyratron
 |
This valve measures 290x103mm overall and has three leads |
This is a hydrogen thyratron aimed at use as a radar modulator
| Filament voltage (a) | 2.5 ±0.1 V |
| Filament current | 38A |
| Max peak anode voltage (b, d) | 14kV |
| Peak anode current (b, d) | 400A |
| Min trigger pulse voltage (c) | 500V |
| DC grid voltage | -100V |
| Max rate of rise of anode current (b) | 200A/sec |
(a) During the first 50 hours of life a warming up time of 10 minutes is required. A further 5 minutes may be required for the HT to be increased to its full value. After 50 hours of use a 2 minute warming up time is sufficient provided the valve has been operating during the previous 50 hours - otherwise a 10 minute warming up period is required.
(b) These ratings are for operation with
- repetition frequency of 1000 pps
- pulse length of 1.25µs
- sensibly square pulse shape
- load resistance of 17.5 ohms
- anode cooling by an air stream at 2.5" ± 0.5" water head
- DC resonant charging
(c) The trigger pulse should be between 1 and 3µs long at the 500V (or higher) level. The source impedance of the trigger pulse generator should be between 250 and 500 ohms. The DC resistance of the grid-cathode circuit should not exceed 2000 ohms.
(d) The valve contains a hydrogen replenisher and therefore cannot be used much below the ratings given
(e) No object should be placed within 1" of the glass of the valve during operation
| Lead | Function |
| Yellow | Filament |
| Black | Filament |
| White | Grid |
