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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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13th Nov 2019, 5:03 pm | #1 |
Hexode
Join Date: Sep 2005
Location: Powys, Mid-Wales, UK.
Posts: 289
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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 |
13th Nov 2019, 5:12 pm | #2 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
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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 |
13th Nov 2019, 7:31 pm | #3 |
Hexode
Join Date: Sep 2005
Location: Powys, Mid-Wales, UK.
Posts: 289
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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 |
13th Nov 2019, 7:48 pm | #4 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Does anyone have any information on these old FADA valves please?
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14th Nov 2019, 11:02 am | #5 |
Hexode
Join Date: Sep 2005
Location: Powys, Mid-Wales, UK.
Posts: 289
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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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18th Nov 2019, 1:54 pm | #6 |
Hexode
Join Date: Sep 2005
Location: Powys, Mid-Wales, UK.
Posts: 289
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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? |