Universal Audio UAFX Ruby '63 Top Boost Amplifier

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

Effects	Boost	Type	sector
Technology	Digital	Use	electric guitar
Format	Pedal	Color	Pink
Cabinet Simulator	3

Tones	cleans, complex overdrive, classic vibrato	Inputs	2 TS 6.35mm jacks (right input for stereo connections and 4-cable mode)
Channels	Normal, Brilliant, Vibrato	Outputs	2 TS 6.35mm jacks (right output for stereo connections and 4-cable mode)
Built-in boosts	treble booster and preamp booster (vintage inspirations)	Height	6.5 cm (2.56 inches)
Modifications and additional content	classic speakers, free additional cabinets and microphones downloadable after pedal registration	Width	9.2 cm (3.62 inches)
Modes	Live and Preset	Depth	14.1 cm (5.55 inches)
UAFX Control mobile app	footswitch customization, preset recall/archiving, access to extra features, artist preset downloads	Weight	0.567 kg (1.24 lbs)
2x12 SILVER	inspired by rare 15 W speakers	Power supply	not included (sold separately)
2x12 BLUE	inspired by original "Bulldog" speakers	Required power	9 V DC, center negative
2x12 GREEN	inspired by modern G12H-type speakers	Minimum current required	400 mA
Additional free cabinets via app	1x12 AC15-type, 2x12 Matchless-type, 2x12 Two-Rock