The power stage is handled by 4 Tesla EL-84 tubes which put out about 45 watts.
The controls on the front of the unit from left to right consist of: Bass, Mid, Treble, Volume, Expand Switch, high input, low input. Z was going for a design with an emphasis on tone and felt that reverb or an effects loop would compromise the tone and integrity of the signal path. Z does not make retro or copy amps and this amp is no exception.
The expand switch bridges a capacitor across the first gain stage cathode resistor for an extra thick tone. The controls on the back of the unit consist of 3 jacks for 4,8 or 16 ohms. While it certainly borrows concepts from classic Western Electric circuit designs, you wont find its schematic in the Tube Amp Book.
The head-cabinet is a very small, sexy enclosure measuring 9.5″ tall, 19.5″ wide and 9.5″ deep. The amp employs a fairly novel conjunctive filter circuit before the output stage which seems to really juice the amp up and give it a very original tone. Z has his own special formulation (Sprague) capacitors which are not available commercially.
This amp was ahead of its time and is still kicking strong.
The master and gain settings allow many different shades from clean to crunch.Hey friends, I'm looking to buy a new head, and have narrowed it down (thus far) to two options:1) Hughes & Kettner Tubemeister 18id=142&prod=Tube Meister 18 Head OR2) Carvin V3M watched a ton of You Tube videos and things like that, and I really love the HK's cleans.As stock, my evaluation unit had 2 NOS Phillips 12AX7s in the first gain stage and phase inverter, and a Sovtek 12AX7 powering the 2nd and 3rd gain stages.Rectification was handled by a Groove Tubes “Reactive” solid state rectifier but may also be ordered with a GZ-34 rectifier tube.