Seymour Duncan Twin Tube Classic. Uses two of these tiny medical tubes - they have to be soldered in, so it's not a swap out easily deal like a 12ax7. However, the pedal sounds GREAT. Two channel, with volume/gain on each, and a master bass/treble. True bypass. Got mine for $210 out the door at guitar center. Some of my boost/drive pedals are going on ebay soon.
Pete
Pete
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