Triotron

Valve List

Brand Advert. •Popular Wireless •August 4, 1928.

P215 P420 P425 P430 P440 E235 E422 & YN4 Advert. •Wireless World •December 2, 1931.

Range Advert. •Valve Data Booklet, Wireless World •1932.

Range Advert. •Wireless World •August 12, 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.

Range Advert. •Wireless World •February 9, 1934.

S215, S208, A214, E235 & P225 Advert. •Wireless World •November 30, 1934.

RD4

UD2

6B7

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