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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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3rd Aug 2022, 9:26 am | #1 |
Heptode
Join Date: Sep 2010
Location: Hythe, Hampshire, UK.
Posts: 632
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Valve Identification & Use
Over the past few days I have been testing and cataloguing the many valves I have. While doing this I came across a valve I can find no data for, it says 'Telephones and Cables Limited' on the label and AX294 is painted on the glass inside the envelope and also written on the label. I am assuming this might have been used in a voice repeater circuit? As you can see it is a triode with a single filament heater running vertically. Does anyone have data on this and / or know what it was used for?
I also have two other valves both EG100 one marked 230-250 and the other 220-230 with different bases. The radio museum site has data on this valve https://www.radiomuseum.org/tubes/tube_eg100.html but I was wondering what they were used in? Hope someone can help, thanks |
3rd Aug 2022, 10:37 am | #2 |
Octode
Join Date: Jun 2006
Location: St Osyth, Nr Clacton, Essex, UK.
Posts: 1,482
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Re: Valve Identification & Use
It would appear the word "Standard" is missing from your label - the part remaining uses the familiar STC font as seen on SenTerCel rectifiers etc. Can't improve on your guess for its application though.
Graham
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3rd Aug 2022, 11:48 am | #3 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,007
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Re: Valve Identification & Use
Yes it is a STC valve... They have a long history of valve manufacture, involving the Birmngham Small Arms company (BSA) and a brand name 'micromesh' - they ultimately became Brimar.
What your valve was originally intended for I don't know but some embedded part of the telephone network would be a fair suggestion.
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3rd Aug 2022, 12:20 pm | #4 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
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Re: Valve Identification & Use
The EG100 you mention sound like some form of barretter. STC manufactured a large range of line amplifier valves for telephone applications. John.
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3rd Aug 2022, 12:37 pm | #5 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Valve Identification & Use
Quote:
https://nvhrbiblio.nl/biblio/boek/Th...01926-1946.pdf Lawrence. |
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4th Aug 2022, 6:23 am | #6 |
Heptode
Join Date: Sep 2010
Location: Hythe, Hampshire, UK.
Posts: 632
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Re: Valve Identification & Use
G6Tanuki, The other side of the AX294 has a label on which is written the valve number and this covers the 'Standard' on the wrap around label.
Lawrence, Thanks for the link to the PDF they are definitely rectifiers according to the Radiomuseum website and the figures are for the heater voltages. I'm still interested to know what equipment the AX294 and EG100 valves were used in, but I'm guessing it may well remain a mystery! |