Glass Jaw Fuzz

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The Glass Jaw Fuzz is a new take on one of the loudest and meanest circuits in existence, the Acapulco Gold (AG). The AG is a power amp smashing into another power amp, and is said to have been designed to emulate a dimed Sunn Model T preamp. However its one knob only controls the loudness of the output signal and for some considered impractical above a certain loudness threshold.

Enter the Glass Jaw, a circuit designed by Alec Breslow of Mask Audio Electronics. Perfectly designed for bass, the Glass Jaw splits up the input signal into a clean channel and a fuzz channel. The fuzz channel is then augmented by two independent bands of EQ (THUD and GLASS) that allow you to shape the frequency response into all new fuzzy textures for your bass. The LOUD control pairs really well with the CLEAN control, allowing you to add more loudness and compression to the fuzz channel, before cleaning it up with the dry buffered input signal.

Part machine, part beast, this hybridized circuit turns your bass into a horrifying, snarling, roaring bastard that will leave your band members complaining of your effect use, grabbing for their ear plugs, and having meetings about you behind your back. And why wouldn’t they? Who could possibly ignore you with the commanding presence that this pedal allows you to achieve – nay, demands? And you know, who cares about them anyway? Fire those tasteless jerks. You don’t need them anyway. You know what you do need though? Supremely doomy bass fuzz.

The enclosure finish is sanded and polished by hand. To complement its hybrid sound, the artwork features a minimalized rendition of Bruce the mechanical shark as it appeared behind the scenes of the Jaws films.

I do not own any copyrights to the circuit itself, nor do I have any affiliation with the Jaws franchise. This is just a one-off pedal designed for personal use, but am selling it to allow me to continue creating more new pedals.


  • EQ section includes bass (THUD) and treble (GLASS) control
  • CLEAN knob mixes the distorted signal with the clean input signal, preserving low-end and taming the harsh bite of the circuit
  • True bypass
  • 100% Hand-made with high-quality components


  • THUD – Boost or cut the bass frequencies from the distorted signal
  • GLASS – Boost or cut the treble frequencies from the distorted signal
  • CLEAN – Blends the distorted signal with the clean signal
  • LOUD – Controls the loudness of the distorted signal, interplays with the CLEAN control to find the perfect balance between loudness and sanity


  • Power: 9V DC, center negative. No battery compartment.


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Return Policy

I gladly accept returns and exchanges.
Contact me within: 7 days of delivery
Ship items back within: 14 days of delivery

I do not accept cancellations on custom orders.
But please contact me if you have any problems with your order.

I cannot accept returns or exchanges for custom or personalized orders
unless the item arrives damaged or defective.

Conditions of Return:
Buyers are responsible for return shipping costs. If the item is not returned in its original condition, the buyer is responsible for any loss in value.

Shipping Information

Processing Time:
Depending on availability, the time I need to prepare an order for shipping varies. For custom builds, please allow 3-4 weeks lead time. For finished builds, please allow 1-2 weeks for processing.

Estimated Shipping Times:
Eco Post: 7–5 business days estimated distribution time for most destinations (see below), 10–12 business days estimated distribution time to Australia and Hong Kong.
Registered Mail: 4–8 weeks
I will do my best to meet these shipping estimates, but cannot guarantee them. Actual delivery time will depend on the shipping method you choose.

*** UPDATE***
Postal systems around the world appear to still be adapting to the global impact of COVID-19. This means that shipping times may be longer than we had previously been used to. I ask that you please be patient while we track the status of your package together.

Shipping Methods:
I ship out all pedal orders via Eco Post. This method is typically quicker than Registered Mail (advertised estimation is 7–5 business days, but due to the current situation has been known to take a bit longer, depending on the country), and it also features computerized tracking and proof of delivery.
This method is available in the following countries: Austria, Australia, Italy, Ireland, the United States, Belgium, Brazil, the United Kingdom, Germany, Denmark, South Korea, the Netherlands, Hong Kong, Greece, Japan, Norway, Spain, Poland, Portugal, Finland, France, Canada , Sweden, Switzerland, Thailand, Russia.

For PCB orders, you can choose between Eco Post and Registered Mail.

Customers living in Israel can arrange for Local pickup, just contact me for arrangements.

Customs and Import Taxes:
Buyers are responsible for any customs and import taxes that may apply. I am not responsible for delays due to customs.


Each Carcharias Effects pedal is hand-made by one person in his home workshop who loves making music, and making things that make music. Every purchase you make enables me to continue making more pedals, so your support is very much appreciated. That said, I take responsibility for the build quality of every pedal I make comes, and offer a 24-month warranty on each one, not covering normal wear-and-tear or abuse.

All the PCBs that I sell on this site were designed personally by me, but the fabrication is outsourced to third-party PCB fabrication services. Once they are designed, I order them in relatively small batches. I personally test every batch that I receive; however, as I am a strong believer in minimizing waste, there are cases in which I may sell perfectly functioning PCBs that might have some design flaw. I take responsibility for these design flaws (if any) and will specify their fixes or workarounds in the product's specific build document.

If you should encounter any issues with your product, please feel free to reach out to me via the contact form on this website. As I am based in Israel, I understand the inconvenience added by international shipping, and so I will be happy to assist in troubleshooting with you any problems before resorting to international shipping in case a repair needs to be made.