This is a barely used 65Amps Stone Pony low power head with that signature 7591 power tube tone, the only one that exists with factory custom built in reverb. Switch it in or out, you don't even know that it's there. The Stone Pony enjoys the flexibility of our exclusive 'Bump' front end that employs an EF86 preamp tube feeding a 12AX7 phase inverter. We've adjusted the tone stack to accommodate the Stone Pony's unique power tube, an unusual one called the 7591 that you'd find on old Ampegs from the '60s. This unique tube has a very distinctive mid-range notch and excellent distortion characteristics, but also a nice, aggressive clean sound. It gets a really nice furry distortion reminiscent of the '60s Stones and Faces. We've optimized the transformers for the 7591's with the guys at Mercury Magnetics and nailed the old 7591 format only with a much-enhanced vocabulary. With the six-way knob you can dial in anything from a nice pleasant crunchy rhythm sound all the way up to full on modern distortion. It's a very dynamic tube that way. In addition, the tube reflects each guitar you're playing extremely well, so that you hear and feel the distinct characteristics of your guitar.