Antique radios, Old Time Radios
QX21
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Country:
Switzerland
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| Identical to |
QX21
= PL21
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| Was used by |
Technology / Measurement |
| Filament |
Indirect / Specified voltage AC/DC |
| Description |
Edelgasgefüllte Tetrode.
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| Information source |
Schweizer Elektronenröhren 1917-2003, Willi E. Seite 61
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QX21: Electron Tube Handbook BBC
Aldo Patriarca
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QX21: BBC Handbuch 1
Aldo Patriarca
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