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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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5th Dec 2017, 12:42 am | #1 |
Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
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An old valve
I couldn't resist this box of valves at our local auction when I saw this amongst the mainly 50's pulls. It has A23 on the pinch which might be 1st batch of 1923. Needless to say the filament is o/c but a nice display piece. It's surprisingly heavy.
I now have 100+ more valves to store in the garage but fortunately there were only a few TV types. |
5th Dec 2017, 2:11 pm | #2 |
Nonode
Join Date: Jun 2007
Location: Coulsdon, London, UK.
Posts: 2,152
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Re: An old valve
I assume it is an Ediswan triode.
Does it have 'R' or 'AR' markings on the glass? |
5th Dec 2017, 6:33 pm | #3 |
Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
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Re: An old valve
It says:
Royal Ediswan AR |
6th Dec 2017, 8:11 am | #4 |
Hexode
Join Date: Jul 2016
Location: Ashby de la Zouch, Leicestershire, UK.
Posts: 253
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Re: An old valve
I bought an o/c filament type like this once. The connections from the valve to the pins were actually soldered external joints at base of pins. I resoldered the filament connections and the valve was OK again !
Worth checking on these externally connected pins on old valves.
__________________
"One small step for man".....because he has arthritis. www.retinascope.co.uk Albert. |
6th Dec 2017, 10:49 am | #5 |
Octode
Join Date: Jan 2003
Location: Ware, Herts. UK.
Posts: 1,082
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Re: An old valve
It's one of these then
http://www.r-type.org/exhib/aaj0061.htm a nice find, even if the filament is o/c. John |