Antique radios, Old Time Radios
P425
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Country:
Great Britain (UK)
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| Identical to |
P425
= B405
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| Similar
Tubes |
Normally replaceable-slightly different:
420SP
Other base:
P425_UX
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| First year |
Sep.1928
- - Manufacturers Literature Leaflet
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| First Source
(s) |
Sep.1928 : - - Manufacturers Literature Marconi leaflet
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| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Foo)
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 4 Volts / If 0.25 Ampere / Direct / Battery = |
| Description |
Dull emitter super-power audio amplifier. 17mA anode current at 150V with 16.5 negative grid bias. 2.5Kohm impedance. Also made with UV base.
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Dimensions (WHD)
incl. pins / tip |
44 x 106 x mm / 1.73 x 4.17 x inch |
| Weight |
46 g / 1.62 oz |
| Information source |
- - Manufacturers Literature
Taschenbuch zum Röhren-Codex 1948/49
History of the British Radio Valve to 1940
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P425: rtt
Anonymous 10 Collector
More ...
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Just Qvigstad
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P425: MARCONI VALVES MANUAL
Jose Casas-Avalos
More ...
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):6
Collection of
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Variants
Different shape and slightly different data.
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Forum contributions about this tube
P425
Threads: 1 | Posts: 3
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Hits: 3169 Replies: 2
P425 (P425)
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Wolfgang Thiel
29.Sep.07
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1
Hi all
I would like to add a photo of a P425 from Osram. I can see there are various Models (Madzda, Lissen) and I'm not sure if the photo goes under the common tube type or a new Model? Can someone help me out.
Thanks
Wolfgang
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Roy Johnson
29.Sep.07
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2
Hi Wolfgang,
Please load to the P425_Mazda_Marconi. These are closely the same and differ in detail from the other tubes of the same name.
Many thanks and best regards,
Roy
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Ernst Erb
05.Mar.11
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3
If a tube has the same designation and the same values - but quite different looks (bulb, base material etc.) then a member can create a variant, giving a short differency as name and filling in some text into the notes. The most important is - after acceptance of the variant to load up the pictures for the variant.
I believe that the P425 is not a common Europe but a common UK valve. Either Roy Johnson or Peter den Boer might know and change if that is right. What I don't know is if we can say it is UK and Commonwealth if common Britain - or if we should differenciate ... and have two different common for that.
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P425
End of forum contributions about this tube
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