Universal Audio UAFX Ruby '63 Top Boost Guitar Amplifier Pedal

SKU: UAGPMRUBY MFR: GPM-RUBY
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Key Features

  • Experience iconic '63 Top Boost amp tones with this versatile guitar amplifier pedal.
  • Achieve studio-quality sound with UAFX Ruby, offering exceptional dynamic range and clarity.
  • Explore a range of amp voicings perfect for any genre, enhancing your guitar's versatility.
  • Enjoy seamless stereo connections and 4-cable mode for advanced routing capabilities.
  • Built for durability, the Ruby '63 pedal ensures reliable performance on stage and in studio.
  • Easily update firmware via USB-C for continuous improvement of your amplifier pedal's sound.
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Special Order?Estimated to Ship: 08/25/2025
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Universal Audio UAFX Ruby Specifications

  • Power requirements

    Isolated 9VDC, center-negative, 400mA minimum (power supply sold separately)

  • Inputs

    2 x 1/4" unbalanced TS (input 2 for stereo connections and 4-cable mode)

  • Outputs

    2 x 1/4" unbalanced TS (output 2 for stereo connections and 4-cable mode)

  • Input impedance

    500 Kilohms (Mono In)
    1 Megohms (Stereo In)

  • Output impedance

    500 Ohms

  • Maximum input level

    12.2 dBu

  • Maximum output level

    12.1 dBu

  • Dynamic Range

    115 dB (A-weighted)

  • Signal to noise ratio

    -115 dB (A-weighted)

  • Frequency response

    20 Hz to 20 kHz, +/-3 dB

  • A/D and D/A conversion

    24-bit, 44.1 kHz

  • USB Type-C

    For registration and firmware updates via computer

  • Wireless technology

    Bluetooth v5

  • Transmitted Frequency Range

    2.400 GHz - 2.4835 GHz

  • Maximum Output Power

    +4.35 dBm

  • Dimensions (H x W x D)

    With Knobs and Protrusions: 2.56 x 3.62 x 5.55" (6.5 x 9.2 x 14.1cm)

  • Weight

    1.24 lbs (562.45g)

  • UPC Code

    819937003332

Designed For Use With:

  • Guitar Pedal

Need Help?

For any questions about compatibility with this product, call us at 800-223-2500 or you can email us any time.

About Universal Audio UAFX Ruby

Get the British Invasion tones that inspired generations
The UAFX Ruby '63 Top Boost Amplifier pedal gives you the quintessential British valve amp beloved by artists and producers for over 60 years, from Queen to U2 to Radiohead.

Built on powerful dual-engine processing and UAD modeling expertise, the Ruby '63 effects pedal delivers choirboy cleans, complex overdrive, and classic vibrato.

• Get the valve amp that powered the British Invasion, perfectly emulated in a stompbox
• Stay inspired with rich Top Boost tones and tube-powered vibrato
• Take ace studio amp tones anywhere, complete with legendary mic/speaker pairings and famous boost effects
• Download artist tones, customize features, explore presets, and more with UAFX mobile app

Experience British Tube Amp Tones, Stage and Studio
Whether it's replacing your amp rig and going direct to front-of-house on stage, or recording tracks into your DAW - Ruby '63 gives you the inspiring, album-ready tones of an expertly miked "golden unit" vintage tube combo, within seconds.

Explore Normal, Brilliant, and Vibrato Channels
Ruby '63 is the only stompbox that gives you the Normal, Brilliant, and Vibrato channels from the original amp - so you can fly to Ireland, London, or Liverpool with the flip of a switch. From mellow to chime to grind, it's all here.

Push the Limit with Classic Boosts
Ruby '63 packs classic boosts, right onboard. Namely, the legendary '60s Dallas Rangemaster germanium treble booster and the preamp of a '70s Maestro EP-3 tape delay. Just flip the Boost switch for searing layered tones that put IR-based amp modelers in the bin.

Customize your Sound with the UAFX App
Ruby '63 really gets cracking with the UAFX Control mobile app. Download custom artist tones, recall and archive your presets, and dive deeper into the amp that ignited the British Invasion.

Universal Audio UAFX Ruby Features

  • Powerful UAFX dual-engine delivers the most authentic '60s British tube combo sound ever placed into a stompbox
  • Includes the world's best speaker cabinet, mic, and room tones derived from the award-winning OX Amp Top Box
  • Features "hot rod" treble booster, preamp boost, and speaker swaps, plus free additional downloadable speaker cabinets and mics upon registration
  • Bypass cabinet/mic emulations and use in front of your amp for added tonal flavor and overdrive sounds
  • UAFX mobile app lets you customize footswitches, recall and archive your presets, unlock additional features, download artist presets, and more
  • Timeless UA design and craftsmanship, built to last decades

Product Documents

User Manual

Key Features

  • Experience iconic '63 Top Boost amp tones with this versatile guitar amplifier pedal.
  • Achieve studio-quality sound with UAFX Ruby, offering exceptional dynamic range and clarity.
  • Explore a range of amp voicings perfect for any genre, enhancing your guitar's versatility.
  • Enjoy seamless stereo connections and 4-cable mode for advanced routing capabilities.
  • Built for durability, the Ruby '63 pedal ensures reliable performance on stage and in studio.
  • Easily update firmware via USB-C for continuous improvement of your amplifier pedal's sound.

What's in the box:

  • Universal Audio UAFX Ruby '63 Top Boost Guitar Amplifier Pedal
  • Universal Audio 1 Year Limited Warranty