04-01-2012, 11:39 AM
I believe that is probably the external antenna jack. These two pages will explain everything:
http://philcoradio.com/phorum/showthread.php?tid=1472
http://www.philcoradio.com/phorum/showth...p?tid=2599
http://philcoradio.com/phorum/showthread.php?tid=1472
http://www.philcoradio.com/phorum/showth...p?tid=2599
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Ron Ramirez
Ferdinand IN