Diamond Pedals Diamond Phase

The Diamond Phase is a phaser pedal from Diamond Pedals, a modern revival of the company's original PSH-1 Phase, which was first introduced in 2008¹. It is a fully analog audio path built around six carefully selected and matched JFET transistors in every pedal¹, and its main trick is a selectable 2-, 4-, or 6-stage architecture that gives you three distinct phaser voices in a single pedal¹. It sits in an enclosure approximately half the size of the original PSH-1, with top-mounted jacks and true bypass switching¹.

What it does: 2-, 4- or 6-stage JFET phasing

A phaser works by sweeping a series of frequency notches through your signal. More stages means more notches, and a deeper, more pronounced effect. The Diamond Phase uses a classic JFET-based phaser topology, where each stage is built around a voltage-controlled JFET acting as a variable resistor¹. Gearnews notes the pedal is based on six carefully selected and matched JFET transistors², which is what allows the three stage modes to be pulled from one circuit.

You select the modes via a mini toggle switch in the center of the pedal². Each voice has its own character, as Diamond describes it:

The 4-stage position is the newcomer here. The original PSH-1 was a 6-stage design, so the 2- and 6-stage voices carry over its character while the 4-stage mode adds the more familiar four-notch sweep associated with classic phasers¹. Speed is adjustable over a range of 0.1Hz to 10Hz¹.

Diamond says this JFET approach delivers exceptionally smooth, musical phase shifting with depth, warmth, and clarity¹. Gearnews attributes that same quality directly to the matched transistors:

Power and connections

The Diamond Phase runs on 9 to 15 VDC, negative tip, through a 2.1 mm barrel jack, and draws 80mA at 9 VDC¹. There is no battery option in the stated power specification. Input impedance is greater than 1MΩ and output impedance is less than 10KΩ¹.

A Black Edition of the pedal is also listed by Diamond. It shares the same circuit description, power requirement and 80mA current draw³, and adds an internal voltage pump that boosts the circuit to 15V operation³. On the standard pedal, running more than 9V means feeding it more voltage externally, up to the 15V ceiling.

For comparison, the MXR Phase 100 runs on 9 volts DC per its Dunlop manual⁴, so the Diamond Phase's wider 9 to 15V window gives it more headroom in the power department than that classic.

Controls and switching

The control surface is minimal by design. The center mini toggle selects the stage mode², and the speed control covers the 0.1Hz to 10Hz range¹. The footswitch supports both Momentary and Latching functions², which means you can set it to engage the effect only while your foot holds the switch down, useful for quick stabs of phasing, or leave it in standard latching mode.

Switching is Relay True Bypass¹, so the bypassed signal is routed by a relay rather than a mechanical footswitch contact. Among other compact phasers, the Anasounds Phase Lag uses gold true bypass switching⁵, a more conventional mechanical approach.

History: a compact revival of the PSH-1

The original Diamond PSH-1 Phase was first introduced in 2008¹. Guitar Pedal X describes the Diamond Phase as Diamond Pedals reissuing and shrinking its well loved 2008 PHS-1 6-Stage JFET Phase-Shifter into a compact edition⁶. The new enclosure is approximately half the size of the original¹, with top-mounted jacks to save board space¹.

One feature did not make the trip. The original version had a Phaser/Vibrato switch, which Guitar Pedal X reports has been felt surplus to requirements on this occasion⁶. So the PSH-1's vibrato option is gone, and the Diamond Phase is a phaser only.

The reissue arrived in April 2026, available widely at leading international dealers as the coverage went live⁶. Gearnews listed the European price at €279.00 at launch², while Diamond's own page lists the regular price at $249.00¹.

What reviewers said

Gearnews reviewed the launch and was positive on value:

The pedal also caught the attention of That Pedal Show, which featured the Diamond Pedals Phase in its Five Fantastic Phasers episode, with a double/half speed segment at the 26:00 mark of the video⁷.

Warranty and build

All Diamond products purchased through the diamondpedals.com website or authorized dealers come with a three-year warranty against failure resulting from defective parts and/or faulty workmanship, for the original owner only and not transferable¹. The pedals are designed and built entirely in Diamond's own shop in Montreal, Quebec¹.

Videos

Click to load

Click to load

Click to load

Questions