Fitted with an integral water jacket, the Hypervapotron-cooled anode of the TH 561 can dissipate 20 kW, with a comfortable safety margin.
| GENERAL DESCRIPTION |
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The TH 561 is a ceramic-metal tetrode of coaxial structure employing Hypervapotron anode cooling. It can be used as a CW oscillator, AF or RF power amplifier operating up to 300 MHz. Fitted with an integral water jacket, the Hypervapotron-cooled anode of the TH 561 can dissipate 20 kW, with a comfortable safety margin. |
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| TECHNICAL SPECIFICATIONS | |
| ELECTRICAL | |
| Type of cathode | Thoriated tungsten |
| Heating | Direct |
| Filament voltage | 7.0 V ± 2% |
| Filament current | 140 A |
| Maximum surge current | 450 A |
| Interelectrode capacitances : - cathode - control grid (g1) - cathode - screen grid (g2) - cathode - anode - g1 - g2 - g1 - anode - g2 - anode |
83 pF 5.3 pF 0.12 pF 135 pF 0.8 pF 17 pF |
| Amplification factor, g1 - g2 | 5.5 |
| Transconductance (Ia = 2 A) | 60 mA/V |
| MECHANICAL | |
| Operating position | Vertical |
| Anode cooling |
By circulating distilled water at high temperature |
| Maximum anode dissipation | 20 kW |
| Minimum water flow | 12 l/mn |
| Maximum temperature of inlet water | 50 °C |
| Maximum temperature of outlet water | 90 °C |
| Maximum pressure allowed at the water-jacket input | 4 bar |
| Maximum temperature at any point of the ceramics | 250 °C |
| Weight, approx. | 4.4 kg |
| Specifications may change without notice | |
| THIS TUBE IS USED IN THE FOLLOWING SHORTWAVE BROADCAST TRANSMITTERS | ||
| Manufacturer | Transmitter specifications | Power in kW |
| Telefunken | S 4003 | 300 |
| S 4005 | 500 | |
| S 4105 | 500 | |
| THIS TUBE IS AVAILABLE FROM | ||
| Manufacturer | Rebuilder | Distributor |
| Thales | Econco | |
| 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 |