The GUP Tech GrindR Douche Edition is a clean boost pedal with a bypassable preamp built in. GUP Tech describes it as a three-in-one design: 20 dB of clean boost, plus an old school Integrated Preamp with bass and treble controls, switchable with the left toggle. It sits in the boost family but with the preamp engaged it works closer to a preamp pedal with tone controls.1
Controls and how they work
The pedal is built around two toggles and three knobs, and the left toggle changes what the knobs do1.
| Control | What it does |
|---|---|
| Level | Sets the boost amount |
| Bass | Active in Preamp position |
| Treble | Active in Preamp position |
| Left toggle | P (Preamp) engages the preamp and activates Bass and Treble; B (Bypass) removes the preamp, leaving only Level and EQ type |
| Right toggle | Switches between the original Grind EQ and the 33 EQ |
In Bypass mode the pedal behaves as a straight clean boost: level only, with the EQ type still selectable. In Preamp mode the bass and treble controls come into play, which is where the tone shaping happens.1
Power: 9V only
GUP Tech specifies 9Vdc only, center negative, and states plainly that anything over 9V will blow the pedal. Do not run it from a higher-voltage output.
Current draw is 21 mA, so a standard 9V supply handles it without trouble.1
Douche Edition, colors and availability
The Douche Edition is GUP Tech's sparkling-enclosure treatment, a line the maker has applied to several pedals including the Donut Douche Edition and The Rewolwer - Douche Edition. This one comes in Chrome Green and Metallic Green. It was listed at £99.00 GBP on the maker's page.1
The standard version of the circuit is covered on the GUP Tech GrindR page; the GrindR Douche Edition is a variant of that design, sold by GUP Tech as a separate pedal.1
Questions
How much boost does the GUP Tech GrindR Douche Edition give?
GUP Tech rates it at 20 dB of clean boost. That is enough headroom to push an amp harder or lift a quiet part of your signal chain, and because the preamp section is bypassable you can use the pedal as a straightforward level boost or as a tone-shaping preamp depending on where the left toggle is set.
What do the P and B positions on the left toggle do?
The left toggle switches the preamp in or out. In the P (Preamp) position, the Bass and Treble controls become active so you can shape the tone. In B (Bypass) mode, the preamp is out of the circuit and you only have the Level control and the EQ type toggle to work with.
What is the 33 EQ on the GrindR?
The right toggle switches between two EQ voicings: the original Grind EQ and the 33 EQ. GUP Tech's product page names the two options but does not describe the tonal character of the 33 voicing in detail, so the quickest way to hear the difference is to flip the toggle while playing.
Can I run the GrindR Douche Edition on 12V or 18V?
No. GUP Tech specifies 9Vdc only, center negative, and warns that anything over 9V will blow the pedal. Keep it off higher-voltage outputs and daisy chains that supply more than 9V.
What colors does the GrindR Douche Edition come in?
The Douche Edition is offered in Chrome Green and Metallic Green color options, according to GUP Tech's product page.
Sources (1)
- GrindR Douche Edition, GUP Tech
