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Synchrodyne · 18th Jul 2017, 5:45 am

From further searching, one may get back at least to 1956 with “Q”. Electronics magazine for 1956 September carried the article on the Lin quasi-complementary amplifier circuit, and this used Q1, Q2, etc., for the transistors. Going back to say 1953 one finds some circuits with the transistors labelled as “jT”, presumably for “junction transistor”. Terman 4th edition (1955) used “T”.

Popular Electronics magazine changed to “Q” from its 1958 December issue. In 1958 November and previously it had used “TR”. At that time Radio-Electronics magazine was using “V”. It appeared to have changed to “Q” by the end of 1962.

Given that Lin was an early user of Q, it could have been an RCA idea, which at least provides another search vector in the quest for its origin.

Cheers,

18th Jul 2017, 5:45 am	#19
Synchrodyne Nonode Join Date: Jan 2009 Location: Papamoa Beach, Bay of Plenty, New Zealand Posts: 2,944	Re: Lesson R,L,C,T,V,D but Q and U ? From further searching, one may get back at least to 1956 with “Q”. Electronics magazine for 1956 September carried the article on the Lin quasi-complementary amplifier circuit, and this used Q1, Q2, etc., for the transistors. Going back to say 1953 one finds some circuits with the transistors labelled as “jT”, presumably for “junction transistor”. Terman 4th edition (1955) used “T”. Popular Electronics magazine changed to “Q” from its 1958 December issue. In 1958 November and previously it had used “TR”. At that time Radio-Electronics magazine was using “V”. It appeared to have changed to “Q” by the end of 1962. Given that Lin was an early user of Q, it could have been an RCA idea, which at least provides another search vector in the quest for its origin. Cheers,