A signal splitter/combiner built to solve the usual problems with A/B/Y boxes — signal loss, phase issues between amps, and low-impedance fuzz pedals losing their character when run through a standard buffer.
Key Features
- Custom-wound, nickel-core 1:1 transformer keeps the signal clean without adding extra treble
- Each channel has its own switchable JFET buffer
- Custom-developed photocells (~50 ohms resistance vs 300-400 ohms typical) for silent switching, no pops or clicks
- Phase switch and Ground Lift on the B channel
- Compact, smaller footprint than the original ABY-ST
Built to Solve the Usual ABY Problems
A custom-wound, nickel-core 1:1 transformer keeps the signal clean without adding the extra treble that a standard transformer often introduces, so fuzz and drive pedals stay round rather than harsh. Each channel has its own switchable JFET buffer — useful to disengage for low-impedance pedals like a Fuzz Face, which tend to lose tone and over-distort when run through a buffer. Custom-developed photocells with around 50 ohms of resistance (against the 300-400 ohms typical of standard optocouplers) keep switching silent, with no pops or clicks.
Controls
- A/B/Y selector: chooses which amp channel (or both) receives your signal
- JFET buffer switches: individual buffer on/off for each channel
- Phase switch: corrects phase issues between two amps
- Ground Lift: addresses grounding noise on the B channel
Power
Power requirements not independently confirmed this pass — please check your own unit or the manual before publishing.
Who Is This For
Worth a look if you need a genuinely transparent way to split your signal to two amps — particularly useful if your rig includes low-impedance fuzz pedals that need the buffer switched off to sound right.
[Video to be confirmed and added]
What does the Fulltone ABY-ST V2 do?
It’s a signal splitter/combiner (A/B/Y box) built to avoid signal loss, phase issues, and the tonal problems low-impedance fuzz pedals can have with standard buffers.
What power supply does the ABY-ST V2 need?
We’re confirming this detail and will update this answer shortly.
Is switching silent on the ABY-ST V2?
Yes. Custom-developed photocells with around 50 ohms of resistance keep switching pop-free and click-free.
Can I turn the buffer off for fuzz pedals?
Yes, each channel has its own switchable JFET buffer, which you can disengage for low-impedance pedals like a Fuzz Face that tend to lose tone through a standard buffer.
What is the Phase switch for?
It corrects phase issues that can occur when running two amps together, preventing thin or hollow-sounding tone.
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