Quote:
Originally Posted by jr_tech
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. |
Pre-war tubes didn't have the EIA codes on them. Philco tubes didn't have it until the late 40's, as well as Silvertone and some other tubes that were supplied by Sylvania.
