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      CUSTOM BUILT AMPLIFIERS :: by Billy ZGuitar Repair

 
 
 
GZ30

Equipped with a 12” Jenson Jet Tornado speaker.

Solid pine cabinet, finger jointed, Floating Baffle. Covering is glued with animal hide glues for the best tone.

Tubes: GZ34 rectifier, 6L6GC power tubes, 12AX7 preamp tubes.

The GZ30 is a simple design inspired by Billy Z’s favorite Amps of the 50’s, but it does have many refinements and other circuit characteristics which may not be obvious. The component selection is not by chance either, even the solder, “Cardas Eutectic“.

The GZ30 is a cathode biased, class A/B design, with a variable voltage regulator to lower power output from 30 watts down to 3 watts.

Mercury Magnetics Transformers.

Custom Aluminum Chassis

You will find the GZ30 to be an extension of your instrument and voice.

 
 
 
GZ30 "Austin Special"

The GZ30 "Austin Special" head is based on the GZ30 but with much larger Power Transformer and a huge output transformer with optimized primary. Transformers are custom built by Mercury Magnetics for the GZ series of amplifiers.

Voltages are higher, the output transformer has 4 , 8, and 16 ohm speaker outs .
Phase invertor has been redesigned for optimum operation. The power supply has been redesigned for a more modern and versatile sound.

Fuller body tone more highs and lows than the little brother combo amp.

GZ30 "Austin Special" Features

  • 1-GZ34 rectifier tube
  • 2 - 6l6gc power tubes
  • 2 - 12ax7 preamp tubes
  • 30 Watts , class A/B Cathode biased
  • .80 Aluminum chassis
  • Finger jointed Pine Cabinet
  • All Coverings are applied with Hide Glue
  • Premium Handles and Large Rubber Feet
  • All Electronic components are selected for maximum tone and durability.
  • Cardas Quad Eutectic Solder (the only solder Billy Z uses!)
  • High Grade Switchcraft Jacks , no plastic jacks to strip or melt.
  • IEC detachable power cord. Custom “Bob Crump” designed power cords are optional .
  • Interactive tone and volume controls, hi and low inputs. The Dana Hall VVR circuit has been customized for the GZ30 series of amplifiers.
  • Diode protected rectifier tube and soft start standby are employed to assure years of trouble free operation.
  • The amps are currently shipping with Tungsol power and preamp tubes and a Sovtek 5ar4. The amps can accommodate other tubes with similar characteristics.


"The amp is designed to be part of your “Instrument”. It is very touch sensitve responsive and can go from clean to mean with just your guitar volume control.
Accepts all Pedals very well and I personally recommend the Wampler Faux Reverb pedal. The Wampler reverb pedal combined with the GZ30 creates a 3D sound .
Please enjoy the GZ30 Austin Special." - Billy Z