Antique radios, Old Time Radios

2-443

Country:	Netherlands	Brand:	Thermion; Netherlands
		Tube type:	Vacuum Pentode Power/Output
			Ca. 1925 up to 1945 rare.

Tube ID = 10533

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Identical to	2-443
Similar Tubes	Normally replaceable-slightly different: B443
Production stop	Feb.1938

Base	Europe 5-Pin (O5A, B5) (Codex=Foo)
Filament	Vf 4 Volts / If: 0.15 Ampere / -: Direct / -: Battery = /
Description	To avoid the Philips penthode patent, Thermion calls it a tetrode because the surpressor grid is connected to the grid instead of the kathode/filament. Nevertheless, this is a plug-in replacement for the B443. Also available with B4 base + sidecontact.
Literature	Taschenbuch zum Röhren-Codex 1948/49 - - Manufacturers Literature 1933

2-443
Peter den Boer

2-443: own collection
Peter den Boer

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