Antique radios, Old Time Radios
M604
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Country:
Netherlands
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| Identical to |
M604
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| Similar
Tubes |
Normally replaceable-slightly different:
C453
; PP430
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| Base |
Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Foo)
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| Filament |
Vf 4 Volts / If 0.3 Ampere / Direct / Battery = |
| Description |
To avoid the Philips penthode patent, Tungsram and Radio Record used a special constructed tetrode with penthode characteristics. See the other basinf diagrams.
Also with B4 base + sidecontact.
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| Information source |
Taschenbuch zum Röhren-Codex 1948/49
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M604: rtt
Anonymous 10 Collector
More ...
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Just Qvigstad
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M604: own collection
Peter den Boer
More ...
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