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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 5th Dec 2017, 12:42 am   #1
PJL
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Default 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.
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Old 5th Dec 2017, 2:11 pm   #2
Silicon
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Default Re: An old valve

I assume it is an Ediswan triode.

Does it have 'R' or 'AR' markings on the glass?
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Old 5th Dec 2017, 6:33 pm   #3
PJL
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Default Re: An old valve

It says:

Royal
Ediswan
AR
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Old 6th Dec 2017, 8:11 am   #4
Viewmaster
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Default 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.
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Old 6th Dec 2017, 10:49 am   #5
jjl
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Default Re: An old valve

Quote:
Originally Posted by PJL View Post
It says:

Royal
Ediswan
AR
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
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