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Valve List

P215 P420 P425 P430 P440 E235 E422 & YN4 Advert.
•Wireless World
•December 2, 1931.
Range Advert.
•Valve Data Booklet, Wireless World
•1932.
Brand Advert.
•Wireless World
•November 17, 1933.
S.434N S.435N A.440N P.440N S.2034N S. 2035N A.2040N & P.2020N Advert.
•Valve Data Booklet, Wireless World
•1933.
 
 

RD4

UD2

6B7

59
 
 
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