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Synchrodyne · 19th Jul 2017, 3:58 am

Possibly Toshiba used "S" for silicon-based device? But if so, we might also expect to find "G" for germanium.

In the early Sony case, I imagine that "X" was for Xtal = crystal triode.

Cheers,

19th Jul 2017, 3:58 am	#21
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 ? Possibly Toshiba used "S" for silicon-based device? But if so, we might also expect to find "G" for germanium. In the early Sony case, I imagine that "X" was for Xtal = crystal triode. Cheers,