As far as legendary amps...there's the Dumble amplifier made by Alexander Howard Dumble. The Steel String Singer doesn't have overdrive or anything. It's an amplifier that is clean sounding and yet is able to produce a great big sound. Alexander didn't make a whole lot of these but they are such strong amplifiers - Stevie Ray Vaughan used them, Bonnie Raitt used them. A lot of artists of back then were using these amps. If you wanted to call it a boutique amplifier, I guess you could but to me really it's just a double amp. One of the best amplifiers made in the world today.