"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," says Rene Martinez, the legendary guitar technician for blues guitarist John Mayer.more
I think the key to the Dumble tone is that it has such touch sensitivity; and it is has such an organic feel. The notes are full, yet almost liquid...very hard to describe in words. The sustain on clean tones is amazing, and you can really hear the tubes work and change as the notes decay. The overdrive is very, very smooth.