The Universal Audio Uafx Ruby '63 Top Boost Amplifier is a Universal Audio boost pedal, currently around $349. Close alternatives include the Knight Audio Technologies Kat-STB and the TC Electronic Ampworx Vintage Series DC30. It pairs well with the Divided by 13 JRT 9/15 and the Suhr Bella 1X12 Hand wired Combo New.
Universal Audio Uafx Ruby '63 Top Boost Amplifier
Universal Audio · pedal
The Universal Audio UAFX Ruby '63 Top Boost Amplifier is a Vox AC30 Top Boost amp emulation from Universal Audio (Santa Cruz, California), delivering a DSP-modeled recreation of the 1963 Vox AC30 Top Boost amplifier for the chiming, jangly British clean and light breakup tone used by The Beatles, Brian May, and countless classic British Invasion players. The Ruby '63 Top Boost Amplifier uses Universal Audio DSP-powered analog-modeling to deliver studio-quality vox ac30 top boost amp emulation in a compact pedalboard format.
- chiming
- british
- boost
- sparkle
- jangle
- jangly
- chime
- analog
Good for
- Live
- Silent Recording
- Silent Stage
- Studio
Price updated Aug 26, 2026
Genres the Universal Audio Uafx Ruby '63 Top Boost Amplifier is commonly used in
- Indie
Amps that pair well with the Universal Audio Uafx Ruby '63 Top Boost Amplifier
Divided by 13 JRT 9/15
Divided By 13
39% matchDivided by 13 JRT 9/15 is voiced for Vox-style amps — Universal Audio Uafx Ruby '63 Top Boost Amplifier gives it exactly that
Suhr Bella 1X12 Hand wired Combo New
Suhr
38% matchUniversal Audio Uafx Ruby '63 Top Boost Amplifier leans into Vox-style amps, precisely the platform Suhr Bella 1X12 Hand wired Combo New wants
Bad Cat Cougar 15
Bad Cat
tonal matchInto Universal Audio Uafx Ruby '63 Top Boost Amplifier, Bad Cat Cougar 15 is right at home: it's built around Vox-style amps
Bad Cat Era 30 Head
Bad Cat
tonal matchBad Cat Era 30 Head is voiced for Vox-style amps — Universal Audio Uafx Ruby '63 Top Boost Amplifier gives it exactly that
Bad Cat Lynx 50
Bad Cat
tonal matchInto Universal Audio Uafx Ruby '63 Top Boost Amplifier, Bad Cat Lynx 50 is right at home: it's built around Vox-style amps
Bad Cat Hot Cat 45-Watt
Bad Cat
tonal matchBad Cat Hot Cat 45-Watt is voiced for Vox-style amps — Universal Audio Uafx Ruby '63 Top Boost Amplifier gives it exactly that
Bad Cat *PRE Order* Hot Cat Head
Bad Cat
tonal matchBad Cat *PRE Order* Hot Cat Head's own voicing points at Vox-style amps, and Universal Audio Uafx Ruby '63 Top Boost Amplifier delivers it
Dr. Z Amplification Z-Wreck Head
amplifier
tonal matchDr. Z Amplification Z-Wreck Head's own voicing points at Vox-style amps, and Universal Audio Uafx Ruby '63 Top Boost Amplifier delivers it
Pedals that stack with the Universal Audio Uafx Ruby '63 Top Boost Amplifier
Paul Cochrane Timmy
Paul Cochrane
9% matchPaul Cochrane Timmy leans toward transparent, and that's a real, usable character to pair with
Tech 21 SansAmp
Tech 21
9% matchWhat Tech 21 SansAmp brings here leans toward analog warmth — that's worth building a pairing around
Electro-Harmonix Small Stone
Electro-Harmonix
9% matchElectro-Harmonix Small Stone's analog warmth voice goes after Universal Audio Uafx Ruby '63 Top Boost Amplifier in the signal chain — it's not there to compete with Universal Audio Uafx Ruby '63 Top Boost Amplifier's own airy character
Pigtronix Philosopher King
Pigtronix
7% matchPigtronix Philosopher King's own compressed character is the real reason this is worth trying
Keeley Halo
Keeley
6% matchKeeley Halo's ambient voice goes after Universal Audio Uafx Ruby '63 Top Boost Amplifier in the signal chain — it's not there to compete with Universal Audio Uafx Ruby '63 Top Boost Amplifier's own airy character — goes in the amp's FX loop (or last, into a clean amp)
Alexander Pedals Radical Delay
Alexander Pedals
6% matchAlexander Pedals Radical Delay's pristine voice goes after Universal Audio Uafx Ruby '63 Top Boost Amplifier in the signal chain — it's not there to compete with Universal Audio Uafx Ruby '63 Top Boost Amplifier's own airy character — goes in the amp's FX loop (or last, into a clean amp)
AmpRx BrownBox
Amprx
tonal matchAmpRx BrownBox is voiced for Vox-style amps — Universal Audio Uafx Ruby '63 Top Boost Amplifier gives it exactly that
Audiocade 1974 Colorsound Tremolo Clone
Audiocade
tonal matchAudiocade 1974 Colorsound Tremolo Clone's own voicing points at Vox-style amps, and Universal Audio Uafx Ruby '63 Top Boost Amplifier delivers it
Cheaper alternatives
J. Rockett Archer
pedal
65% similarityShared character: gold_sparkle, boost
Vox Valvenergy Mystic Edge
Vox
65% similarityShared character: gold_sparkle, analog
AnalogMan Beano Boost
Analog Man
64% similarityShared character: analog, boost
Mooer Micro Preamp 004 Day Tripper
Mooer
64% similarityShared character: gold_sparkle
Wampler Paisley Drive
Wampler
64% similarityShared character: analog, boost
Boss BP-1
Boss
63% similarityShared character: gold_sparkle, boost
Similar charactersee all similar tone character →
See all alternatives to the Universal Audio Uafx Ruby '63 Top Boost Amplifier (cheaper + boutique) →
Questions people ask
What are good alternatives to the Universal Audio Uafx Ruby '63 Top Boost Amplifier?+
The closest matches in character are the Knight Audio Technologies Kat-STB, the TC Electronic Ampworx Vintage Series DC30, the Lovepedal DOV Death Of Vox Handwired. Budget picks: J. Rockett Archer, Vox Valvenergy Mystic Edge, AnalogMan Beano Boost.
What pairs well with the Universal Audio Uafx Ruby '63 Top Boost Amplifier?+
Strong matches from rig and tone-complementarity evidence: Divided by 13 JRT 9/15, Suhr Bella 1X12 Hand wired Combo New, Bad Cat Cougar 15 — Divided by 13 JRT 9/15 is voiced for Vox-style amps — Universal Audio Uafx Ruby '63 Top Boost Amplifier gives it exactly that.
How much does the Universal Audio Uafx Ruby '63 Top Boost Amplifier cost?+
Around $349 (live listing price, updated Aug 26, 2026).