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RE: If you are experiencing micro phonics with the 12au7(s) used in...
Posted by JoshT on July 2, 2017 at 12:49:23:
Thanks for the suggestion. I'll experiment and keep that in mind. Are mine the long plates (based on the pictures)? Mine were all made in 1958 according to Brett Jesse and also the code numbers etched into the glass at the bottoms.