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ГМИ83В modulator tetrode

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This valve measures 147x65mm overall and has a 4 pin base |
| Heater voltage | 25V |
| Heater current | 2 to 2.5A |
| Min peak anode current | 15A |
| Max anode voltage | 18kV |
| Max screen voltage | 1.25kV |
| Max temperature of envelope and seals | 200°C |

View of the grids and cathode.
| Pin | Function |
| 1 | Control grid |
| 2 | Heater + cathode |
| 3 | Heater |
| 4 | Screen grid |
| TC | Anode |
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