Quote:
Originally Posted by Synchrodyne
Presumably the third party (possibly/probably)Telefunken wanted to introduce an exact copy, physically and electrically, of the American 6AL5. Given that the EB91 designation was already taken by Philips/Mullard for a valve that was electrically similar to but physically different from the 6AL5, that third party felt that it needed a different designation, and for whatever reason it picked EAA91.
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"Whatever reason" is probably the operative phrase... personally I would have gone for EB92! But I guess we will never know now.