CV2434 / Z803U high-stability long-life gas filled trigger tube
 |
This valve measures 41x20mm and has a B9A base |
| Nominal trigger ignition voltage | 132V |
| Max working anode voltage | 290V |
| Min working anode voltage | 170V |
| Nominal anode/cathode maintaining voltage | 105V |
| Typical trigger/cathode maintaining voltage | 95V |
| Max priming current | 25µA |
| Min priming current | 2µA |
| Max peak cathode current | 100mA |
| Max average cathode current (15 secs) | 25mA |
| Max positive peak trigger current (*) | 8mA |
| Max priming anode ignition voltage (darkness or daylight) | 150V |
| Max transfer current (Va=240V) | 25µA |
| Min trigger capacitance to ensure ignition with: (**) | |
| Va=+170V | 1500pF |
| Va=+200V | 1000pF |
| Va=+240V | 500pF |
| Max increase in trigger
ignition voltage when anode voltage is changed from 290 to 170V |
1% |
| Typical stability
of trigger ignition voltage |
+/- 1% |
(*) Negative trigger current should not be drawn by the valve. Such a current occurs if the trigger potential is reduced below 90V during anode conduction.
To limit the positive peak trigger current a resistor of 2.2k ohm is required for trigger capacities between 4700 and 15000pF, and a resistor of 5.6k ohm for capacities greater than 15000pF
(**) To ensure high stability of characteristics in light and darkness a priming discharge of approx 10µA flowing between priming anode and cathode is essential. If the valve is used without priming discharge, delays in trigger ignition of up to 10 seconds may occur and thus appear to impair the stability of the characteristics. However under these conditions the pre-strike current of the valve is reduced considerably.
| Pin | Function |
| 1 | Anode |
| 2 | i/c |
| 3 | i/c |
| 4 | Cathode |
| 5 | Cathode |
| 6 | Priming anode |
| 7 | Cathode |
| 8 | Trigger |
| 9 | Trigger |
The cathode connection should be made to pins 4, 5 and 7 together.