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#2
04-22-2011, 11:33 PM
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Most likely a Philco SF21 or 21EAP4. Be careful! Some of these have 2.35 volt filaments, and you can blow the filament if you assume it is 6 volts and apply that much voltage.
If you have an original Philco CRT in there, it has a very high probability of being bad. The CRTs Philco used in these sets had very poor life. If you're lucky, the original was replaced at some point (sometimes with a 6 volt filament CRT). Then you have a much better chance of having it be good. Tom 
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