B9E base: Difference between revisions
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==Links== | ==Links== | ||
* | * [[wikipedia:Tube_socket#Other_socket_styles|Other socket styles @ Wikipedia]] | ||
[[Category:Tube bases]] | [[Category:Tube bases]] | ||
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Latest revision as of 07:31, 29 June 2024
The 9-pin B9E (Novar) tube base is a larger variant of the B9A (Noval) miniature 9-pin base developed for higher-powered American tubes such as the 7868, 6JE6A, etc.
It has nine pins with 1.02 mm (0.038") diameter in a 17.45 mm (0.687") pin circle diameter arc.
The similar B9D (Magnoval) based used by comparable European tubes has the same pin circle geometry but the tube have a diameter of 1.27 mm (0.046"). Inserting Magnoval tubes into Novar sockets by force will widen the latter's contacts, thereby damaging the socket, whereas a Novar tube will not make reliable contact in a Magnoval socket.
Moreover, many Novar tubes have a glass nipple at bottom of tube which requires a center hole in the socket.