07-20-2013, 08:07 AM
It would probably be better if you posted a photo of your set. The "How To" on photos is found here: http://philcoradio.com/phorum/showthread.php?tid=29 . Then people can ID what you need. The code 121 is a version number, see: http://www.philcorepairbench.com/tips/svctip35.htm