It depends! If you have an older pedal like a mini tube pedal or one of the earlier X-series pedals then it is for adjusting the high voltage supplied to the tubes. Before the pedal was shipped, it was set at a specific value. If you really think you want to mess with this, please reach out to me via the Contact link above and I can give you more details. There is also an internal trimpot on the newer versions of Space Heater, Underground Accelerator, Dr. Wattson, and JC Emerald. This trimpot is usually labeled as "ATTEN" and it is an output attenuator that I add to pedals with an unusually hot output. It is effectively a second "master control" that will limit the overall master volume of the pedal. This is typically set right in the middle at shipping and can be adjusted to any position without damaging the pedal. Additionally Smoke Signal (May 2022 onward) has internal trimpots to adjust the brightness of the LEDs. These should be labeled as "RED" and "BLU" and control the respective red and blue channel LEDs on the pedal. Fluffy Kitten has 4 internal trimpots to adjust the voltage delivered to the JFETs in the pedal, these are biased specifically before the pedal is shipped and while adjusting them will not damage the pedal in any way, there are certain bias points where the pedal will not produce sound. Newer Fluffy Kitten units (July 2022 onward) have an additional trimpot towards the bottom of the circuit board that controls the brightness of the indicator LED.
Here's a few different power supplies that people have been using without issue:
- Cioks DC7 @ 9v setting
- Strymon Zuma with Voodoo Lab PPAP current doubler cable
- Truetone 1 Spot
No. All Sushi Box tube pedals have internal voltage regulators, which means whatever voltage you send it (9-12v) it is always running at the same internal tube voltage of ~235v. If you're looking to change the breakup, you could look at replacing the tube itself. Stop by Talkbass or TheGearPage forums and ask away! Or you can also find me on Facebook The exceptions are of course Fluffy Kitten and Echosaurus, neither of which have a high voltage regulator, so the voltage you give it is the voltage it's getting.
If the pedal you purchased is defective, I will take it back and either repair or replace it, and cover the cost of shipping it back to you. If a pedal comes back for repair and it is determined that either nothing is wrong with it or damage was caused by user error, the customer will be responsible for return shipping. If you are not satisfied with your purchase, you can request a return for refund. All refund requests must be initiated within 10 calendar days of receiving the pedal. All returned pedals will be subject to a 10% restocking fee, and pedals returned not in their original condition (i.e. damaged, missing pieces, etc) may be subject to additional fees. The customer is also responsible for any shipping costs involved in the return.