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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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Old 13th Nov 2019, 5:03 pm   #1
RogerWalker
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Smile Does anyone have any information on these old FADA valves please?

I have been cataloguing my valve collection and am stuck on a couple of early American types, made by FADA, the F-224 and the F-235. They are both on UX5 bases with top caps and squinting through the silvering, they both look like triodes. But there is a very wide gap between the grid and the anode - I am wondering if they could be thyratrons? I have done what I can, searching the Internet, but have drawn a blank. Anyone out there got a USA valve databook from the 1930s?
Hope someone can help Roger
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Old 13th Nov 2019, 5:12 pm   #2
G6Tanuki
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Default Re: Does anyone have any information on these old FADA valves please?

The manufacturer's not that important - the significant numbers being 224 and 235: these were common standard early-30s US types made by loads of people.


http://www.r-type.org/exhib/aaq0317.htm

https://www.radiomuseum.org/tubes/tube_uy235.html
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Old 13th Nov 2019, 7:31 pm   #3
RogerWalker
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Default Re: Does anyone have any information on these old FADA valves please?

Thanks very much. As you are so knowledgeable, might you recognise the valve in the picture? It is a bit like the AR3 but the bayonet base is different.

It has 4 stubby pins
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Old 13th Nov 2019, 7:48 pm   #4
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Default Re: Does anyone have any information on these old FADA valves please?

http://www.r-type.org/exhib/aaj0133.htm

http://www.r-type.org/exhib/aaj0144.htm

http://www.r-type.org/exhib/aaq0345.htm

?

Lawrence.
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Old 14th Nov 2019, 11:02 am   #5
RogerWalker
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Default Re: Does anyone have any information on these old FADA valves please?

That's just amazing Lawrence. Thank you so much. I use the Valve museum a lot and drew a complete blank. There they all were, hidung in plain sight! The only one of the bases I didn't look at was the peanut. My knowledge base on the Wecovalve has gone from zero to chapter and verse! Thank you so much!
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Old 18th Nov 2019, 1:54 pm   #6
RogerWalker
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Default Re: Does anyone have any information on these old FADA valves please?

Here's another mystery valve: It has a B4 base and at first sight looks like an early r-type triode. But it is a diode.
I have seen this form of construction in early high voltage rectifiers, but they usually have a top cap for insulation. Any ideas, please?
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