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Post by Sinatra1982 on Tue Dec 06, 2016 5:26 am

I bought a philco 41-221 without tubes. It takes 6 and the schematic shows that one of them is a XXD. I have never heard of this type tube, can it be replaced with another type tube? Is it a rare tube and or expensive?

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Post by Greg Davis on Tue Dec 06, 2016 7:57 am

14AF7. In an AC/DC radio you may also use 14F7.
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Post by Bill Cahill on Tue Dec 06, 2016 11:54 am

I have a Philco that uses an XXFM.

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