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Synchrodyne · 25th Jul 2017, 1:05 am

The notion that the “Q” symbol stems from the shape of the TO18 case might run into a chronology difficulty. We can trace use of “Q” back to at least mid-1956. On the other hand, a preliminary search finds no reference to TO18 earlier than the 1960s.

Perversely, something I did come across was the use of “T” for tube in a 1951 article that was written by a RCA staffer:

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Cheers,

25th Jul 2017, 1:05 am	#25
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 ? The notion that the “Q” symbol stems from the shape of the TO18 case might run into a chronology difficulty. We can trace use of “Q” back to at least mid-1956. On the other hand, a preliminary search finds no reference to TO18 earlier than the 1960s. Perversely, something I did come across was the use of “T” for tube in a 1951 article that was written by a RCA staffer: Cheers,