The radiator is an integral part of the tube.
The 7800 / TBL12/40 is designed primarily for use as an RF or AF amplifier and oscillator at frequencies up to 30 mc.
| GENERAL DESCRIPTION |
|
The type 7800 / TBL12/40 is a high vacuum power triode of the external plate type requiring forced-air cooling. The radiator is an integral part of the tube. The 7800 / TBL12/40 is designed primarily for use as an RF or AF amplifier and oscillator at frequencies up to 30 mc. | |
| TECHNICAL SPECIFICATIONS | |
| ELECTRICAL | |
| Filament Filament Voltage Filament Current |
Thoriated tungsten, directly heated 8 volts 130 amperes |
| Amplification Factor | 33 |
| Transconductance | 25,000 μmhos |
| Direct Interelectrode Capacitances Plate to Grid Plate to Filament Filament to Grid |
27 μμf 0.6 μμf 45 μμf |
| MECHANICAL | |
| Mounting Position | Vertical |
| Cooling | Forced air |
| Seal Temperature | max. 220 °C |
| Net weight (approx.) | 42 lbs (19 kg) |
| Specifications may change without notice | |
| THIS TUBE IS USED IN THE FOLLOWING SHORTWAVE BROADCAST TRANSMITTERS | ||
| Manufacturer | Transmitter specifications | Power in kW |
| Philips | 8FZ 514 | 50 |
| 8FZ 503 / 8FZ 512 | 120 | |
| THIS TUBE IS AVAILABLE FROM | ||
| Manufacturer | Rebuilder | Distributor |
| Kennetron | Richardson Electronics | |
| PRICE LEVEL (US$) | |||||
| 1 | 2 | 3 | 4 | 5 | 6 |
| 0 - 10 | 10 - 100 | 100 - 1000 | 1000 - 10,000 | 10,000 - 50,000 | 50,000 - 100,000 |