Electronics > Projects, Designs, and Technical Stuff
Which was first ECC82 or 12AU7
(1/1)
Brasto:
Back then in the 50's a new series of electron tubes appeared on the market using the NOVAL type socket.
Identical pin-to-pin equivalents were found in the USA and European products only difference was their marking e.g. ECC82 or 12AU7.
Question:
Being an old Dutchman I like to belief that Philips/Mullard was the original inventer/designer of this double triode which was at a later date coproduced by various USA companies.
Who holds the patent (if any) on e.g ECC82 or 12AU7?
Were 12AU7 produced on same assembly lines as ECC82 but only marked differently?
Who has designed the noval pin base?
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