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philco4me
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Posts: 81
Threads: 19
Joined: Apr 2012
City: West Milford NJ
#1

02-05-2013, 11:29 AM
My 46-1209 has a 7n7 where the 7af7 should be. This radio has been in the family since new so should I keep the 7n7 or replace it with the correct tube
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John R
runawaytruck
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Posts: 94
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Joined: May 2010
City: Albuquerque, NM
#2

02-05-2013, 01:38 PM
A 7N7 is a direct sub for the 7AF7. The only major difference is the 7N7 has a filament draw of 0.6 amps
vs 0.3 amps for the 7AF7. Is probably not a problem for your power transformer as tubes V4/V5 have a
seperate filament winding.
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klondike98
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Joined: Nov 2012
City: Wilsonville State, Province, Country: OR
#3

02-05-2013, 01:45 PM
Checking the NJ7P Tube Database at http://www.nj7p.org/Tube.php , the 7n7 is a substitute for the 7af7 so if its working OK I'd leave it.
Cheers,
Bob
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  1. The PHILCO Phorum
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  3. Philco Electronic Restoration