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Letter Tube Numbers XXL vs. 7A4 etc
Fred R
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Posts: 42
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Joined: Dec 2005
City: Philadelphia, PA
#9

05-13-2008, 07:01 PM
In early Philco books, I see the characteristics are slightly different between the XXL and the 7A4. Later books list them with identical characteristics. Like Randel, I have some XXL/7A4 branded tubes in my 42-350. You will not notice any difference. XXFM is identical to 7X7 so no problem there. FM1000 is unique and nothing replaces it. Another Philco equivelant is 14AF7 and XXD.

I built an FM converter off of Chuck's website. The pre-war Philco FM sets are just so-so performers. There is no limiter stage so they are sensitive to noise but it is neat to hear them play.

Fred
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Messages In This Thread
Letter Tube Numbers XXL vs. 7A4 etc - by Guest - 05-11-2008, 01:52 AM
[No subject] - by Guest - 05-11-2008, 12:37 PM
[No subject] - by Ron Ramirez - 05-11-2008, 02:46 PM
[No subject] - by Guest - 05-11-2008, 07:25 PM
[No subject] - by exray - 05-11-2008, 10:28 PM
[No subject] - by BDM - 05-11-2008, 10:36 PM
[No subject] - by Texasrocker - 05-12-2008, 01:55 AM
[No subject] - by Fred R - 05-13-2008, 07:01 PM



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