Radio Antica e Radio d'epoca
IT103
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Stato:
Olanda
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| Identico a |
IT103
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| Valvole
simili |
Heater different:
C443
; RES374
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| Fine produzione |
Feb.1938 |
| Zoccolo |
Europe 5-Pin , B5 (Eu O, F, O5A) 1928
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| Filamento |
Vf 4 Volt / If 1.1 Ampere / Half indirect / Specified voltage AC/DC |
| Descrizione |
This is a Thermiode, a glass tube in a shielding of nickel-iron alloy to prevent electric or magnetic interference.
To avoid the Philips penthode patent (suppressor grid connected to the filament/cathode), Tungsram, Radio Record, Marathon, Longlife and others called this kind of tubes a tetrode with penthode characteristics. In fact was the suppressor grid connected to the grid. Nevertheless, this IT103 was a plug-in replacement for the C443 etc.
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| Bibliografia |
Universal Vade-Mecum, Electron Valves and Semiconductor Devices group 207
- - Manufacturers Literature 1933
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IT103
Peter den Boer † 2025
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Just Qvigstad
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IT103: own collection
Peter den Boer † 2025
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| Conformità dei dati |
Ulteriori informazioni |
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