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23rd Sep 2019, 4:49 pm
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#1 |
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Triode
Join Date: Aug 2018
Location: Watford, Hertfordshire, UK.
Posts: 43
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Valve Help
I have obtained a French radio from the early 1930s which runs off batteries
it has what I presume are 4 pin European valves running off an LT of 4V one valve in particular has no continuity and I need to replace it - I am having trouble identifying a suitable replacement the valve is marked ONYX on the side and on the top Philips A409 can anybody guide me in the right direction regards Dick |
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23rd Sep 2019, 5:11 pm
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#2 |
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Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,433
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Re: Valve Help
Any help?
https://www.radiomuseum.org/tubes/tube_a409.html https://frank.pocnet.net/sheets/170/a/A409.pdf
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Frank |
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23rd Sep 2019, 6:44 pm
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#3 |
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Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
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Re: Valve Help
A PM3 might be used, maybe with attention to grid bias.
What's the set? Have you any circuit details?
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....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
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23rd Sep 2019, 8:39 pm
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#4 |
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Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
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Re: Valve Help
Or you could use a 2V valve and a series resistor. Is it the detector?
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