The Peace Hill FX TRJM is a tube preamplifier in pedal format, built as an homage to the clean tones of Two-Rock amplifiers. Peace Hill FX describes it as inspired by "Two-Rock's pursuit of beautiful clean tones," and specifically as a nod to John Mayer's clean sound. It is an analog circuit, and like a Two-Rock it carries a 3-band EQ plus three mini switches, which RockBoard's PedalPedia says allow for a super wide range of tones1.
How it is used
The TRJM is meant to act as a preamp rather than a conventional drive in front of an amp. The maker's suggested setup is to place it last in your effects chain and plug it into your amp's FX loop, which is how it delivers its Two-Rock inspired tones1. If you are new to preamp pedals, the preamp pedals type page explains how they differ from overdrive pedals and where they sit in a signal chain.
The TRJM draws 500mA, which is more than a typical daisy chain output provides. Give it its own supply output rated for at least 500mA.
Controls
| Control | What it does |
|---|---|
| 3-band EQ | Bass, middle and treble shaping, as on a Two-Rock1 |
| 3 mini switches | Extend the tonal range across a wide set of voicings1 |
Where it sits in the Peace Hill FX range
Peace Hill FX builds other tube preamp pedals in the same spirit. The Peace Hill FX ODS is a handbuilt, Japan-made tube preamp aimed at Dumble amplifier tones, and the Peace Hill FX SSS is another pedal in the maker's range1.
Videos
John Mayer Gear
Jon Kaneshiro Guitar
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Questions
What power supply does the Peace Hill FX TRJM need?
The TRJM runs on 12V DC with a center negative plug and draws 500mA. That is a higher voltage and current draw than many pedals, so it needs its own dedicated supply output rather than a shared daisy chain. Check that your power supply offers a 12V output with enough current before adding it to a board.
Is the Peace Hill FX TRJM a real tube preamp?
Yes. Peace Hill FX describes the TRJM as a tube preamplifier pedal, and the circuit is analog. It is built as a preamp in a pedal format rather than a conventional drive pedal, and it is designed to be placed last in the effects chain and plugged into an amp's FX loop.
Can the Peace Hill TRJM go in the effects loop?
Yes. The maker suggests placing the TRJM last in your effects chain and plugging it into your amp's FX loop, which is how it is intended to deliver its Two-Rock inspired tones. Running it into the front of an amp is not the usage the maker describes.
What amp is the Peace Hill FX TRJM inspired by?
The TRJM is inspired by Two-Rock amplifiers and their pursuit of beautiful clean tones. Peace Hill FX calls it a homage to John Mayer's clean tone, and like a Two-Rock it offers a 3-band EQ plus three mini switches for a wide range of tonal options.
Sources (1)
- TRJM Tube Preamp by Peace Hill FX, RockBoard PedalPedia, 2026
