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In Reply to: RE: USA Made 12AU7 That Flashes On Start Up posted by Zedguy on April 9, 2016 at 09:06:51:
I have no idea what a Philips acid code is. I do know however, like I stated, that the 280 near bottom of tube is a manufacturer code from Raytheon. Also I have a very similar looking 12AX7 branded Hammond, with the red print, with the other codes/printing rubbed off,which is a Millard, that flashes on startup.
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- OKAY???? - samstone 06:13:34 04/10/16 (0)