I just got this on Reverb in my quest to try as many Dr. Z amps as possible.
The cleans (like most of his amps) are great. They break up a bit sooner than I would like so that removes it from being a pedal platform for my setup. It takes gain and overdrive/distortion pedal like a champ...and the tone stack is something I wish were on all my amps. I wanted to hear what this "bluesbreaker" sound is all about and that is not for me. I want an amp that has a lot of very clean volume for my pedal setup or one that can get very mid-JCM 800. This is not that amp.

Website Specs:
Dr. Z Route 66

32-watt, single-channel tube amplifier head designed for "milkshake thick" tones, utilizing two KT66 power tubes and an EF86 pentode preamp tube. It is known for a non-negative feedback design, offering high gain, input dynamics, and immense sustain, often compared to a "tweed amp on steroids".

Power Output 32 watts

Output Tubes 2 - KT66

Preamp Tubes 1 - EF86 (NOS), 1 - 12AX7

Rectifier 1 - 5U4

Controls Volume, Bass, Treble