Yes, although the SEX amp was a prototype, I believe it was totally stock. I found it to be quieter than Doc's 300B amps. Heck, for the price it is astounding. People fell in love with the sound it put out. A really great amp. I would crank it up all the way and no one could hear anything except dead dark quiet with their up to the drivers on the Lowthers--and they were 101 db eff. Regards, Lew