Dr. Z Amplification

*Note: production of this amp ended in October 2019.

Therapy

“The Therapy has great cleans for the roots players and plenty of drive for the rockers.” – Dr. Z

Specifications

Power Output	35 Watts
Output Tubes	2 – 6L6 STR
Preamp Tubes	2 – 12AX7
Rectifier	5AR4
Controls	Volume, Treble, Mid, Bass, Master
Configurations	Head
Dimensions & Weight	19”W x 9 ¾H x 9 ½D 30 lbs.
Owners Manual	Download

General Information

The Therapy is a departure from what Dr. Z Amps has done in the past. We started with a clean sheet of paper and a fresh sonic perspective. The result is a cathode biased 6L6 based amp with the flavor of a low powered tweed Twin. It has a range of tones that will appeal to a wide audience and it includes a special design post phase inverter master volume which does not lose top-end definition at bedroom settings. Its output is a cool 35 watts with a tube rectified power supply.

Under the hood you’ll find the highest quality components throughout. Special attention was used to select the coupling caps. We chose Jupiter high end hand-rolled coupling caps for the banana yellow Astron tone found in early Fender tweed amps. A high precision PEC sealed volume pot is used for unmatched sensitivity, control, and long life. The large output transformer gives more low end thrust and definition than you can get from a typical amp from the tweed era.
The Therapy has a woody bass response that fills out nicely.We incorporated our unique 2 preamp tube front end that we have mastered in designs from our past. The more American-type overdrive sounds are smooth and harmonically rich while allowing great sustain and clarity. Because the Therapy doesn’t use a cascaded front end you also get great clarity from pedals even at the highest drive settings. This simple design coupled with special EQ wiring maximizes gain, touch dynamics, and guarantees stable frequency response across the dial.

The PPIMV (post phase inverter master volume) helps keep the sound level in check whether you are in church or in an arena. In this circuit the master is very effective with better results than you would get from many attenuators. All in all the Therapy is a great choice for a modern spin on a 6L6 design. It has great cleans for the roots players and plenty of drive for the rockers.