Radio Antica e Radio d'epoca
R4B_Marconi
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Stato:
Gran Bretagna (Regno Unito)
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| Identico a |
R4B_Marconi
= R4B_BTH
= R4B_MO
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| Zoccolo |
Europe 4-Pin B4 (Eu A, E, 4A) 1914
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| Utilizzata per |
Radio/TV-reception etc. |
| Filamento |
Vf 4 Volt / Direct / Battery = |
| Descrizione |
The R4B was first made in 1918 and had an E12 base. In the following years, this was changed to B4. The date of the changeover is uncertain. The tube depicted has the MOV logo and this can be seen at the rear of the tube. It is quite posible that the tube was listed by the Marconi Scientific Instrument Co in one of their publications.
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Dimensioni
(LxAxP)
incl.pins/tip |
x 86 x 50 mm / x 3.39 x 1.97 inch |
| Peso |
33 g / 1.16 oz |
| Bibliografia |
-- Original prospect or advert as per advert in
British Radio Valves - The Vintage Years: 1904-1925 Pages 26, 40 and 122
Saga of the Vacuum Tube, Tyne
-- Collector info (Sammler)
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R4B_Marconi: Fin Stewart
Fin Stewart
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Just Qvigstad
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