Base coaxial contact rings are provided for the filament, grid, and screen terminals, and these terminals are cooled with forced air. The maximu anode dissipation rating is 500 kilowatts steady state, with multiphase cooling.
| GENERAL DESCRIPTION |
|
The 4CM500,000G / TH558 / RS 2078 SK is a ceramic/metal, multiphase-cooled (water/vapor) power tetrode. This tube has a thoriated tungsten mesh filament and pyrolytic graphite grids which provide high-dissipation combined with low secondary emission characteristics. Base coaxial contact rings are provided for the filament, grid, and screen terminals, and these terminals are cooled with forced air. The maximu anode dissipation rating is 500 kilowatts steady state, with multiphase cooling. |
| TECHNICAL SPECIFICATIONS | |
| Filament Voltage (DC or AC) Current at 23.0 volts nominal Peak Maximum Filament Inrush Current at Turn-on |
Thoriated Tungsten 23.0 Volts 500 Amperes 1000 Amperes |
| Amplification Factor, average Grid to Screen | 4.4 |
| Maximum Frequency of CW Ratings | 50 MHz |
| Highest Useful Frequency With Reduced Ratings | 110 MHz |
| Direct Interelectrode Capacitance (nominal values) Cg1k Cg2k Cpk Cg1g2 Cg1p Cg2p |
445 pF 40 pF 0.6 pF 750 pF 6.3 pF 100 pF |
| Maximum Overall Dimensions Length Diameter |
25.7 in; 65.3 cm 12.6 in; 32.1 cm |
| Net Weight (approximate) | 150 lbs; 70 kg |
| Operating Position | Vertical, base down |
| Cooling | Water & Forced Air |
| Maximum Operating Temperature: Envelope and Ceramic/Metal Seals |
200°C |
| Specifications may change without notice | |
| THIS TUBE IS USED IN THE FOLLOWING SHORTWAVE BROADCAST TRANSMITTERS | ||
| Manufacturer | Transmitter specifications | Power in kW |
| Ampegon | TSW 2300D | 300 |
| Continental Electronics | 420 B | 500 |
| 420 C | 500 | |
| Marconi | B 6133 | 250 |
| B 6127 | 500 | |
| B 6128 | 500 | |
| B 6128S | 500 | |
| Hitachi Kokusai Electric | TA-3001 | 300 |
| RIZ Transmitters | OR 250 K-02/A | 250 |
| OR 300 K-02/A | 300 | |
| OR 500 K-01/A | 500 | |
| Telefunken | S 4005 | 100 |
| Thales | TSW 2250 | 250 |
| TSW 2300 | 300 | |
| Thomson | TRE 2335 | 300 |
| TRE 2352 | 500 | |
| TRE 2355 | 500 | |
| Thomson | TSW 2250 D | 250 |
| TSW 2300 D | 300 | |
| THIS TUBE IS AVAILABLE FROM | ||
| Manufacturer | Rebuilder | Distributor |
| Eimac | Econco | Richardson Electronics |
| Thales Electron Devices | Kennetron | |
| 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 |