Diaz Texas Square Face Fuzz
The Diaz Texas Square Face is a germanium fuzz pedal built by legendary amplifier technician and pedal builder Cesar Diaz. Known for his work with Stevie Ray Vaughan, Eric Clapton and Keith Richards, Diaz designed this pedal as a refined take on the classic Fuzz Face circuit with a voice tailored to Texas blues. The Texas Square Face delivers a thick, expressive fuzz that cleans up beautifully with the guitar volume control, making it particularly suited to Stratocaster players and vintage Fender amplifiers.
Manufacturer and Model Background
Cesar Diaz was one of the most respected guitar technicians in the blues and rock world during the 1980s and 1990s. Before building pedals under his own name, Diaz worked closely with Stevie Ray Vaughan as his amp technician and helped maintain SRV's famous Fender Vibroverbs and other vintage amplifiers. After leaving the touring circuit, Diaz began producing boutique pedals designed to recreate and refine the tones he had worked with on stage.
The Texas Square Face emerged during the 1990s as a germanium fuzz inspired by the classic Dallas Arbiter Fuzz Face circuit. While the original Fuzz Face had been used by players like Jimi Hendrix and later Stevie Ray Vaughan, Diaz sought to create a version that responded more consistently and worked especially well with Fender style amplifiers. Production numbers were relatively small and after Diaz passed away in 2002 the pedal became increasingly sought after among collectors.
Why This Pedal Matters in Blues
Few fuzz pedals integrate as naturally into a blues signal chain as the Texas Square Face. Many fuzz circuits can sound harsh or overly compressed, but the Diaz design retains the warmth and responsiveness that blues players rely on. With the fuzz control set moderately, the pedal behaves almost like a thick overdrive with extra sustain. When pushed further it produces a gritty, singing fuzz that still responds to picking dynamics.
This ability to move from warm blues breakup to aggressive Texas fuzz with only the guitar volume knob makes it particularly valuable in traditional blues contexts where dynamic expression is essential.
What Respected Blues Guitarists Did With It
The pedal's roots are directly connected to Stevie Ray Vaughan. While SRV is primarily associated with Tube Screamers, he occasionally used fuzz circuits including the Fuzz Face to achieve heavier sustain and a more aggressive lead tone. Cesar Diaz understood these sounds intimately because he helped maintain SRV's touring rig.
Modern blues players often look to the Texas Square Face as a way to capture that raw Texas blues character. Players in the SRV lineage often combine a fuzz like this with Fender amplifiers such as the Bassman or Deluxe Reverb, allowing the fuzz to push the amp into a thick, harmonically rich overdrive.
Sound Profile
The Texas Square Face produces a distinctive germanium fuzz tone with a warm midrange and a rounded high end.
What Makes It Special
Several factors make the Texas Square Face unique among fuzz pedals. First is the use of germanium transistors, which give the pedal its warm and organic response. Germanium circuits are known for their sensitivity to playing dynamics and temperature, but when tuned properly they produce a smoother and more musical fuzz than most silicon designs.
Second is Cesar Diaz's deep understanding of vintage Fender amplifiers and Texas blues tone. Instead of building a generic fuzz, he voiced the circuit to interact naturally with Fender style amps and Stratocasters. Third is its simplicity. With only two controls, volume and fuzz, the pedal encourages players to shape their sound using the guitar's own controls and playing dynamics rather than relying on complex pedal settings.
Gerbman's playing style draws heavily from Texas blues traditions. The Diaz Texas Square Face fits naturally into that sound because it delivers the aggressive sustain associated with Stevie Ray Vaughan while still allowing expressive dynamics. Placed early in the pedal chain, typically before overdrive pedals, the fuzz can push the rest of the signal chain into a thicker, more saturated blues tone.
Combined with a Stratocaster and a Fender amplifier such as a Bassman or Deluxe Reverb, the pedal produces the kind of explosive yet controllable fuzz that defines many modern interpretations of Texas blues. Gerbman often uses the pedal with moderate fuzz settings, allowing the guitar volume knob to control the transition between clean blues rhythm and saturated lead lines.
Rarity and Availability
The Diaz Texas Square Face is considered somewhat rare to rare on the used market. Production numbers were never large, and after Cesar Diaz's passing in 2002 the original pedals became increasingly collectible. Examples occasionally appear on the vintage market through specialized gear dealers. Prices tend to be significantly higher than typical fuzz pedals due to the pedal's history and direct connection to Stevie Ray Vaughan's amp technician.
Variants and Alternatives
- Original 1990s Diaz Texas Square Face — hand-wired with germanium transistors, highly collectible
- Analog Man Sun Face — boutique germanium Fuzz Face interpretation, very well regarded
- Dunlop Fuzz Face Mini Germanium — widely available budget germanium fuzz
- Dallas Arbiter Fuzz Face (late 1960s) — the vintage reference circuit behind all Fuzz Face designs
