What kind of 12ax7's are these fellas ?


Going thru a late cousins Ham tubes I found a pair of 12ax7
with a orange globe inside an elongated oval,the only wording was Made in Germany.
I just acquired a modded PAS 3 pre and these sound much more refined to me than the JJ12ax7's that came with it,which to me are over the top"punchy" and bass heavy,although adequate I guess.
schubert
When Philips bought Amperex they were sourcing their tubes from various other makers, EI, Mullard, Simens, etc. There should be a Philips code etched into the glass on your Amperex branded 12AX7s and this will tell you who the actual manufacturer of the tubes was.