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These are the tubes I run in everything that runs 6L6 GCs. My '78 135 UL Twin runs over 500v on the plates, and these are the ones that can take it! Very 'musical' and long life. I play pedal steel, and clean is king. I've run a LOT of current production tubes, but these are the ones I always end up with in my Twin, BF Bandmaster, and some old single tube amps.
I mistakenly ordered a set in the wrong heat range once, and AP was good about the replacement.
Nothing but good things to say about these tubes and Amplified Parts!