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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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19th Jul 2014, 6:08 pm | #1 |
Octode
Join Date: Jun 2006
Location: St Osyth, Nr Clacton, Essex, UK.
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1920s(?) valve ID, please
I have an unknown 4 pin base valve and I wonder if anyone can help get near an ID for it, please.
The base is metal (nickel plated?) and above that the envelope is about 2". A lot like a clear light bulb. Inside the Anode is a horizontal tube about 6mm dia and 20mm long. The filament is a single strand with a spiral grid about 2.5mm dia. The only marking I can find says: 4V 50-200V Importe de Hollande Just noticed on the other side it says Philips E Did such valves have a type number or is that it? Graham
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19th Jul 2014, 9:08 pm | #2 |
Moderator
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Location: Exeter, Devon and Poole, Dorset UK.
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Re: 1920s(?) valve ID, please
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Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
19th Jul 2014, 10:24 pm | #3 |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
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Re: 1920s(?) valve ID, please
Ahh, a R Valve style?.
John. |
20th Jul 2014, 12:10 pm | #4 |
Octode
Join Date: Jun 2006
Location: St Osyth, Nr Clacton, Essex, UK.
Posts: 1,482
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Re: 1920s(?) valve ID, please
Thanks. So it's a type E then. Mine has a straight sided section of glass for about 10mm above the metal base. More like the R type illustrations but without the pip on the top. The internal structure looks like the E illustration.
Someone has scratched an X on the base to I suppose it's dud. But may be a useful exhibit somewhere at some stage. Presumably it'll soon be 100 years old. Thanks to all. Graham
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20th Jul 2014, 12:28 pm | #5 |
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Re: 1920s(?) valve ID, please
Hi Graham
It's worth Checking filament continuity Cheers Mike T
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Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
20th Jul 2014, 12:56 pm | #6 |
Octode
Join Date: Jun 2006
Location: St Osyth, Nr Clacton, Essex, UK.
Posts: 1,482
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Re: 1920s(?) valve ID, please
2 x AAs across the filament pins: light!
Good suggestion, Mike. The filament has sagged onto the grid. Maybe it could be sagged the other way. Graham
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20th Jul 2014, 2:56 pm | #7 |
Rest in Peace
Join Date: Feb 2008
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Re: 1920s(?) valve ID, please
The R type and those derived from it, had limited life.
500 hours was not unusual. It was also common to run tham at much higher filament voltage for transmitters or higher power. In those cases, life could be very limited. It is suffiently rare (although not particularly valuable) that I would keep it as a static exhibit unless you have a specific use for it. |