[philco4me]

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

[John R]

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.

[klondike98]

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.