The anode is forced air-cooled, capable of dissipating 5 kilowatts.
The cathode is a thoriated tungsten filament.
Maximum ratings apply to audio-frequency use only.
| GENERAL DESCRIPTION |
|
Type 8C25 is a three-electrode tube designed for use as a modulator, its electrical characteristics making it particularly suitable to Class AB modulator circuits. The anode is forced air-cooled, capable of dissipating 5 kilowatts. The cathode is a thoriated tungsten filament. Maximum ratings apply to audio-frequency use only. |
|
| TECHNICAL SPECIFICATIONS | |
| ELECTRICAL | |
| Filament Voltage | 7.0 Volts |
| Filament Current | 110 Amperes |
| Filament Starting Current | 165 Amps. Max. |
| Filament Cold Resistance | .010 Ohms |
| Amplification Factor, Ec=-200 V; Ib=1.0 A | 6.00 |
| Interelectrode Capacitances Grid-Plate Grid-Filament Plate-Filament |
42 μμf 43 μμf 12 μμf |
| MECHANICAL | |
| Mounting Position | Vertical, Anode Down |
| Type of Cooling Maximum Incoming Air Temperature |
Forced Air 45° C |
| Required Air Flow on Anode Plate Dissipation (Kilowatts) Air Flow - Cubic Fet per Min. Pressure - Inches Water |
5.0 - 4.0 - 3.0 300 - 200 - 175 0.7 - 0.5 - 0.25 |
| Maximum Glass Temperature | 150° C |
| Net Weight, approximate | 19 Lbs. |
| Specifications may change without notice | |
| THIS TUBE IS USED IN THE FOLLOWING SHORTWAVE BROADCAST TRANSMITTERS | ||
| Manufacturer | Transmitter specifications | Power in kW |
| Collins Radio | 207A-1 | 10 |
| 207B-1 | 35 | |
| THIS TUBE IS AVAILABLE FROM | ||
| Manufacturer | Rebuilder | Distributor |
| 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 |