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UAFX Instant Savings Event
Save $50 instantly on the UAFX Knuckles '92 Rev F Dual Rec Amplifier
September 1 through September 30, 2026. The savings are already taken off the price shown, so there is no code to enter and no rebate to file. Available while supplies last.
Questions on this offer, call 844-687-4208.
Universal Audio Knuckles '92 is a three-channel high gain tube amplifier emulation in a stompbox, covering clean, crunch and aggressive distortion. It allows a choice between EL-34 and 6L6 power tubes and between solid-state and tube rectifiers, carries six mic and speaker pairings, and includes a TS-style overdrive, a preamp boost and an integrated noise gate.
Three channels, two power tube types and two rectifiers, in one box.
UAFX pedals come out of the same modeling work as UA's plug-ins. The company measures specific units rather than product categories, which is why its descriptions name a particular amplifier or a particular tape machine rather than a style. The dual-engine processing in these pedals is what allows that detail to run in a stompbox rather than on a computer.
The cabinet, microphone and room emulations come from the OX Amp Top Box, UA's reactive load box. That matters because those emulations were built for a product whose entire job was replacing a miked cabinet, not added to a pedal afterward.
The UAFX Control app handles what the four knobs cannot. Footswitch behavior, preset recall and archiving, additional downloadable speaker cabinets and microphones, and artist presets all live there. Current pedals support MIDI over USB along with Bluetooth and hardwired connections.
At a Glance
| Type | Amp emulator pedal |
| Amp modeled | Multi-channel high gain tube amp, Rev F |
| Channels | 3: clean, crunch, distortion |
| Power tubes | Selectable EL-34 or 6L6 |
| Rectifier | Selectable solid-state or tube |
| Mic and speaker pairings | 6 |
| Overdrive | Built-in TS-style plus preamp boost |
| Noise gate | Integrated |
What Do the Power Tube and Rectifier Options Change?
Feel and response more than tone. EL-34 and 6L6 power tubes distort differently and have different midrange characteristics. A tube rectifier sags under load where a solid-state one does not, which changes how the amp responds to a hard-picked chord. Having both selectable covers two quite different amplifier personalities.
Who Is Knuckles '92 For?
Players covering punk, alt rock and metal who need clean, crunch and high gain in one pedal with a real channel switch rather than a gain knob. The three-channel design and the built-in TS-style overdrive make it a complete rig rather than a single sound.
Can I Use It in Front of a Real Amp?
Yes. The cabinet and microphone emulations bypass, which leaves the amplifier emulation running into a real amp as a preamp and overdrive stage. That is a common way to use these pedals when there is already a good amp in the room.
What Does the UAFX Control App Add?
Footswitch customization, preset recall and archiving, free additional downloadable speaker cabinets and microphones on registration, and artist presets. The pedal supports MIDI over USB along with Bluetooth and hardwired connections, and the app enables footswitch modes carrying four onboard amp presets.
Connections
| Inputs | 1/4 in. instrument |
| Outputs | 1/4 in., stereo |
| Connectivity | MIDI over USB, Bluetooth, hardwired |
| Power | 9 V DC, UAFX supply |
Why Universal Audio?
Universal Audio was founded in 1958 by M.T. "Bill" Putnam, the engineer who built the first recording console with integrated equalization and effects sends, and who designed the 1176 and the 610. The company was revived in 1999 by his sons and now does two things: it still hand-builds analog hardware in California, and it licenses and models the classics from Neve, API, Manley, SSL, Lexicon, Studer, Ampex and others rather than emulating them without authorization.
Frequently Asked Questions
Is this a genuine Universal Audio product?
Yes. Victory is a veteran owned dealer in Miami and units ship new in original packaging with full manufacturer support, including software registration rights.
Is this covered by warranty?
Yes. This unit carries the full Universal Audio manufacturer warranty, registered to you as the original purchaser. Call 844-687-4208 for the current term.
Does it need a special power supply?
UAFX pedals draw more current than a typical analog pedal. UA sells the PSU-GP1-WW supply for the UAFX line, and we stock it. Call 844-687-4208 to add one.
Why Buy From Victory Musical Instruments?
Victory Musical Instruments is a pro audio and musical instrument dealer in Miami, Florida. We support churches, schools, studios and working musicians across South Florida and ship nationwide. Every unit is new in the original factory packaging with full manufacturer support. Call 844-687-4208 to check lead time, request a quote, or arrange local pickup.