In message , Andy Hall writes

Does anybody remember Towers International Transistor Selector?


TITS? Yeah, still got one here somewhere, one with a dot pattern all
over it and another somewhere else but they got replaced when the yellow
ELV (IIRC) books became available, I kind of lost faith in the towers
one when a colleague crossed a 2SC1969 to a TIP41C (RF power transistor
to a general purpose LF device).
--
Clint Sharp