633 Engineering Dragonfly 1x10 Combo review

Cliff Brown presents his take on the classic single-ended low-power valve combo – offered with or without reverb and tremolo

633 Dragonfly
(Image: © Future / Olly Curtis)

Guitar World Verdict

633 Engineering stakes a claim for the ultimate small valve amp with pure Class A tone and impeccable build quality. The Standard Dragonfly makes an exceptional pedal platform, while the RT's effects and cab sim are worth the extra expense.


  • +

    Compact and portable without sacrificing build quality.

  • +

    Ultra-low noise performance.

  • +

    Wide range of clean and low to medium overdrive tones.

  • +

    Exceptional all-valve dynamics and tone.

  • +

    RT's superb digital reverb, optical tremolo and speaker-simulated balanced line out add a lot of versatility.


  • -

    It’s pricey, but you’re getting what you pay for and then some.

  • -

    We’d like the RT's tremolo effect’s max speed to be set a little higher.

You can trust Guitar World Our expert reviewers spend hours testing and comparing guitar products so you can choose the best for you. Find out more about how we test.

Now well known as one of the UK’s top boutique amplification brands, 633 Engineering is headed up by designer Cliff Brown, whose extraordinary bespoke heads and combo amps have gained approval from many top players in the UK and around the world, including Ash Wilson, Stuart Dixon, Micky Moody and blues maestro Kirk Fletcher to name but a few. 

Despite the pandemic pausing live music, 633’s popularity is as strong as ever, with an increased interest in products for home use and recording. 

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Nick Guppy

Nick Guppy was Guitarist magazine's amp guru for over 20 years. He built his first valve amplifier at the age of 12 and bought, sold and restored many more, with a particular interest in Vox, Selmer, Orange and tweed-era Fenders, alongside Riveras and Mark Series Boogies. When wielding a guitar instead of soldering iron, he enjoyed a diverse musical career playing all over the UK, including occasional stints with theatre groups, orchestras and big bands as well as power trios and tributes. He passed away suddenly in April 2024, leaving a legacy of amplifier wisdom behind him.