Quote:
Originally Posted by dieseljeep
Philco used tubes made by Sylvania and RCA. All the loctals were Sylvania and many of the octals were either Sylvania or RCA. The original 50L6, could be easily RCA sourced.
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Take a close look at your "Genuine Philco Tubes" for MFG codes, I suspect that you might find codes for RCA (274) or Sylvania (312) stamped on the tube, along with date code letters or numbers. More info here:
http://www.triodeel.com/eiacode.htm
jr
I agree about changing the cap... it may well have caused the failure of the RCA 50L6.