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Philco newspaper articles 1940
Arran
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06-05-2013, 09:21 PM
Using twin triodes as a mixer and oscillator seems to work quite well, though I don't have any sets that use the XXL tubes I do have two AC/DC sets that use an XXD/14AF7. What I can't understand is why they decided to use a triode as a mixer, maybe another patent royalty dodge? I also can't figure out why they used a silly designation for a tube like XXL or XXD, that must have been the marketing department's idea just to make them sound mysterious then just calling them 7A4s or 14AF7s.
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Arran
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Messages In This Thread
Philco newspaper articles 1940 - by Mondial - 06-04-2013, 02:42 PM
RE: Philco newspaper articles 1940 - by Art Hoch - 06-05-2013, 06:10 PM
RE: Philco newspaper articles 1940 - by Arran - 06-05-2013, 09:21 PM
RE: Philco newspaper articles 1940 - by Mondial - 06-05-2013, 11:28 PM



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