Antique radios, Old Time Radios
20-400
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Country:
Netherlands
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| Identical to |
20-400
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| Similar
Tubes |
Normally replaceable-slightly different:
T78_Record
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| Production stop |
Feb.1938 |
| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914
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| Filament |
Vf 7.5 Volts / If 1 Ampere / Direct / Specified voltage AC/DC |
| Description |
This is a tube from the Thermion Technica series of power amplifiers and power rectifiers.
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| Information source |
- - Manufacturers Literature 1-9-1935
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20-400: Telefunken Werkstattbuch
Wolfgang Bauer
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Just Qvigstad
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20-400: own collection
Peter den Boer
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