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Original Message
RE: I know I have been tough on 12ax7 but.......
Posted by Bilbar on January 27, 2011 at 21:24:35:
tvr2500m is right. The "Mullard" short plate with inclined halo getter is most likely an I60 from the Valvo plant in Hamburg. Quite often a good light and a magnifying glass will reveal the etched production codes, near the base of the tube.