I love me some metal 6F6's, but these metal 6L6's are special too, I have not done a thorough comparison of the two (maybe this weekend). But i'm back in Pentode mode again, with a shiny new dual choke power supply running a 5AR4 (to compensate for voltage lost in the second choke), and a front end that to my ears, sounds better with 6SL7's...IMHO...
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