CV2188 travelling wave amplifier
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This valve measures 423x65mm overall, 30mm across the body. The stem measures 13x323mm. It has an octal base with 4 pins fitted. |
This is a travelling wave tube. It carries the internal markings LZN 11.J.W.
| Heater voltage | 6.3V |
| Nominal heater current | 950mA |
| Nominal 1st anode voltage (a) | 1.3kV |
| Max 2nd anode and helix voltage (b) | 3.2kV |
| Nominal collector voltage | Va2 + 0.05 |
| Max cathode current | 18mA |
| Max 1st anode current | 500µA |
| Max 2nd anode and helix current | 4mA |
| Minimum pre-heating time | 120sec |
| Max output | 2W |
| Minimum bandwidth (c) | 1000MHz |
| Wavelength | 6.5 to 8.5cm |
| Focusing field | 300 oersteds |
| Amplification (d)(e) | 20dB |
| Minimum cold transmission loss | 32dB |
| Minimum air cooling | 4cu ft/min |
(a): The first anode draws negligible current and may be supplied by a potentiometer connected between the helix supply and cathode.
(b): The optimum helix voltage for individual valves lies between 2.8 and 3.2kV
(c): Between 3dB power points
(d): With collector current of 14mA and helix voltage within ±20V of the optimum value
(e): for small signal levels; At maximum output it is approx 4dB lower.
| Pin | Function |
| 1 | n/c |
| 2 | Heater |
| 3 | no pin |
| 4 | 1st anode |
| 5 | no pin |
| 6 | no pin |
| 7 | no pin |
| 8 | Heater + cathode |
| SC | 2nd anode and helix |
| TC | Collector |
