The Essentials to Know About the Universal Audio UAFX Ruby '63 Top Boost Amplifier Pedal
- An amp + stereo cabinet in a pedal: play with headphones, record in the studio, or connect directly to the front of house with a mix-ready sound.
- Three iconic channels (Normal, Brilliant, Vibrato) and vibrato to cover the British Invasion palette, from "chime" cleans to rich crunches.
- Classic British boosts built-in: a 60s-style germanium treble booster and a preamp inspired by vintage tape echo to thicken attack and presence.
- Customization via the UAFX Control app: presets, footswitch assignments, content downloads, and additional options.
A Modern Tribute to the 60s "Top Boost" Sound
The UAFX Ruby '63 Top Boost Amplifier follows in the tradition of British tube combos that shaped the British Invasion and, more broadly, modern pop/rock guitar. Universal Audio leverages its UAD expertise and a
dual-engine processing to reproduce the grain of a vintage amp:
angelic cleans with pronounced harmonic texture, a
complex overdrive that naturally thickens when pushing the amp, and a
vibrato with an immediately musical character. This approach is designed to recreate the "amp" feel under your fingers, with a lively response and dynamics that follow your playing.
A Pedal Designed for Direct Live and DAW Recording
The Ruby '63 targets guitarists looking to lighten their setup as well as those seeking a coherent solution between stage and studio. In
live settings, it replaces an amp + cabinet setup with a stereo output ready for front of house, while maintaining a "real amp" feel and a wide sound image. For
recording, it offers a quick path to inspiring takes without getting lost in complex chains: plug in, choose your cabinet tone, and play.
It is particularly suited for styles where articulation and "chime" matter: pop, British rock, indie, alternative, worship, edgy blues, but also heavier rock when using the boosts and amp settings. If you want to integrate it into a traditional pedalboard, the Ruby '63 can also be used
in front of an amp: you can
bypass the cabinet/mic simulations to use the pedal as a preamp/colour box to enrich your tone and add extra saturated timbres.
Channels, Boosts, Cabinets, and Customization: A True Control Center
The Ruby '63 offers three preamp personalities via its
Normal, Brilliant, and Vibrato channels, allowing you to switch from warm roundness to sharper brightness, or a sound animated by vibrato. To go further, the
Boost switch provides access to two highly sought-after signatures: a
60s-style germanium treble booster (ideal for making the pick stand out, tightening the low end, and making crunch sing) and a
preamp boost inspired by a 1970s tape echo, perfect for thickening the signal and adding drive and presence.
Regarding cabinet simulation, the Ruby '63 includes combinations from the UA ecosystem and
room modeling options to add air and depth without losing precision. For front of house, you have
three 2x12 cabinet models: SILVER (inspired by rare 15 W speakers), BLUE (inspired by original "Bulldog" speakers), and GREEN (inspired by modern speakers with a firmer character). Through the
UAFX Control app, you can unlock additional
free cabinets after registering: a 1x12 AC15-type, a 2x12 Matchless-type, and a 2x12 Two-Rock, each with its own personality to adapt the Ruby '63 to your guitar, pickups, and context (studio, stage, home studio).
Finally, the pedal offers
Live and Preset modes to switch between immediate "on-the-fly" use and more structured recall of settings. The app also allows you to
recall and archive your presets and explore ready-to-play tones, all while maintaining an ergonomics designed for pedalboards.
The Sound
The Ruby '63 stands out with a British sound that is both
brilliant and
three-dimensional, with the sensation of a speaker that "breathes" and a very clear attack. In clean, it delivers a rich chime, ideal for open chords, arpeggios, and precise rhythms. When pushing the amp, the saturation becomes denser without losing definition: harmonics layer, notes remain distinct, and the pedal naturally responds to guitar volume and pick intensity. The vibrato adds an organic modulation, perfect for widening a sound without becoming intrusive. In spirit, it's the kind of tone associated with great British sounds heard from iconic artists like
Queen,
U2, or
Radiohead, with enough versatility to go from vintage tones to modern productions.
Technical Specifications
Modeling & Processing
- UAFX dual-engine processing reproducing, in a pedal, the authentic sound of a 1960s British tube combo
- Tones: cleans, complex overdrive, classic vibrato
- Channels: Normal, Brilliant, Vibrato
- Built-in boosts: treble booster and preamp booster (vintage inspirations)
- Cabinet, microphone, and room options derived from the OX Amp Top Box concept
- Ability to bypass cabinet/mic simulations for use in front of an amp
- Modifications and additional content: classic speakers, free additional cabinets and microphones downloadable after pedal registration
- Modes: Live and Preset
- UAFX Control mobile app: footswitch customization, preset recall/archiving, access to extra features, artist preset downloads
Included Cabinet Models
- 2x12 SILVER: inspired by rare 15 W speakers
- 2x12 BLUE: inspired by original "Bulldog" speakers
- 2x12 GREEN: inspired by modern G12H-type speakers
- Additional free cabinets via app: 1x12 AC15-type, 2x12 Matchless-type, 2x12 Two-Rock
Connectivity
- Inputs: 2 TS 6.35mm jacks (right input for stereo connections and 4-cable mode)
- Outputs: 2 TS 6.35mm jacks (right output for stereo connections and 4-cable mode)
- USB Type C port for firmware updates from a computer
Format & Construction
- Premium UA design and build, engineered for durable use
- Height: 6.5 cm (2.56 inches)
- Width: 9.2 cm (3.62 inches)
- Depth: 14.1 cm (5.55 inches)
- Weight: 0.567 kg (1.24 lbs)
Included Accessories
- Power supply: not included (sold separately)
Power Consumption
- Required power: 9 V DC, center negative
- Minimum current required: 400 mA
en 
Verified
