Antique radios, Old Time Radios
IT103
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Country:
Netherlands
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| Identical to |
IT103
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| Similar
Tubes |
Heater different:
C443
; RES374
|
| Production stop |
Feb.1938 |
| Base |
Europe 5-Pin , B5 (Eu O, F, O5A) 1928
|
| Filament |
Vf 4 Volts / If 1.1 Ampere / Half indirect / Specified voltage AC/DC |
| Description |
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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| Information source |
Universal Vade-Mecum, Electron Valves and Semiconductor Devices group 207
- - Manufacturers Literature 1933
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IT103
Peter den Boer
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Just Qvigstad
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IT103: own collection
Peter den Boer
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