PastFX announces Gallstone Phaser, a Small Stone V2 recreation

October 22, 2025 · 3 sources

PastFX has announced the Gallstone, a recreation of the vintage Electro-Harmonix Small Stone V2 phaser with additional controls. Delicious Audio reported the pedal on October 22, 2025¹; Guitar Pedal X published its write-up on October 16, 2025².

The maker describes the Gallstone as a true-bypass operational transconductance amplifier (OTA) phaser³. A 2/4 stage pushbutton switches between modes, with a red LED indicating 4-stage mode, which the maker calls the stock original, and a blue LED indicating 2-stage phasing³. Mix, feedback and rate controls are on the top panel, along with a Level control that the maker says corrects the volume drop of the original³. An LED indicates the LFO³.

The original's two-position Color switch is split into separate controls. An 8-way rotary Width control and a separate feedback control replace it; the maker states that Color "On" equates to Width position 8 with feedback at maximum, and Color "Off" equates to Width position 5 with feedback fully off³. A Voice pushbutton switches between two feedback network versions³. The Expand control switches in what the maker calls an extra bit of additional circuitry, described as a tuned 2-stage high "Q" all-pass filter³. A Range switch offers standard or super-slow LFO sweeps³. Guitar Pedal X also lists an internal max feedback trimmer².

The pedal runs on 9V DC via a 2.1mm Boss-style negative-tip jack and draws 80mA, in a 1590B enclosure³. The maker notes that on first power-up, especially in slow range mode, the circuit may take a few seconds to charge before it functions, and calls this expected behavior³. Guitar Pedal X gives a typical price of $203 on PastFX's webstore and Reverb.com store².

Guitar Pedal X's Stefan Karlsson wrote that the output "can get somewhat distorted if you crank up the Level and Feedback"². Delicious Audio described the Gallstone as "a faithful recreation of that classic circuit"¹.