Astounding tone; harmonics and controlled dynamic response are arguably the best we’ve heard from this style of amp
— Guitarist Magazine - August 2016

I founded 633 Engineering to pursue my long term obsession with producing the ultimate in electric guitar amplification.
My amplifiers represent the culmination of more than 30 years experience working in Pro-Audio, designing, building, servicing and customising backline and professional audio electronics and over 35 years of playing electric guitar.
I wanted to create an amplifier that would allow each guitar's unique voice to be heard without masking its tone in any way. I wanted an amp that could have its sweet spot at any volume level and that would allow me to use the guitar's volume and tone controls to maximum effect. It had to be reliable and give consistent tone night after night. It also had to be a thing of beauty.
633 amplifiers are designed and built to the highest no-compromise standards. Classic designs have been refined and new features added to give the player another level of tonal response, touch sensitivity, versatility and reliability. 
Using the very best components they are built to last a lifetime. The designs have been tested and refined over many years and have proved themselves time after time on the stage and in the studio.
Cliff Brown

Prior to forming 633 Engineering Cliff was the Chief Design Engineer at Blackstar Amplification. Before that he was the Chief Design Engineer at Soundcraft. In both companies he was responsible for many of their award winning products.  He has also worked in professional recording studios and as a freelance musician and engineer.

Drive King receives 633 Engineering's second 10/10 and Guitarist Mag Gold Award

It’s simply one of the best heads we’ve ever plugged into
— Guitarist Magazine - October 2017

Read the full review here



Custom 36 gets Guitarist magazines' coveted Gear of the Year award

If you’re looking for an amp at the apex of what’s out there for lyrical, virtuosic blues and rock you really should audition one of these
— Guitarist Magazine Dec 2016

Read the full review here


Micky Moody joins the 633 club

633 Engineering wins top marks in Guitarist Magazine

Guitarist Magazine gave the Groove King a whopping 9/10 and a Choice Award and the Custom 36 a staggering 10/10 and a Gold Choice Award. 

To find out why check out the comprehensive review in the August 2016 edition or online at Music Radar:-

Groove King Review

Custom 36 Review

Micky at The Albert Hall

Micky at The Albert Hall

British guitar legend Micky Moody (Whitesnake, Snafu, Juicy Lucy, Chris Farlowe) took delivery of his 633 'Custom MM' 45 watt head and 2x12 cabinet last month.

"My 633 MM Custom is a real beauty. It has power, warmth and scope. In fact, it has everything!"


Micky is currently touring with Ali Maas and promoting the release of their album Black & Chrome

Kirk Fletcher and 633 Engineering

On his 2015 tour blues guitarist Kirk Fletcher used the Groove King and Classic 45.  For the 2016 tour we built him a combo to his own spec. The 'Tweed Bluesman' is a 40 watt 2x12 combo based on the classic late '50's 5F6A Fender Bassman with a hefty dose of 633 Engineering to beef up the reliability, get the noise floor to an absolute minimum and add more tonal flexibility.  This now resides  with Kirk in Switzerland.  For this years tour Kirk is using the Jazz & Blues combo which we built for his performance at the Bristol Jazz & Blues festival back in March.  There is a glowing review of this amp in this months edition of Guitarist where it scored a massive 9/10 and Choice award.

Kirk has been a member of Charlie Musselwhite's band, spent four years in the Fabulous Thunderbirds and most recently played alongside Joe Bonamassa on his 'Three Kings' tour.  

He is now based in Switzerland so we will be seeing a bit more of him in the UK. 

Find out more about Kirk at his website here

"There is no doubt about it – Fletcher is a “monster guitarist” – a huge talent capable of scaling the heights of blues stardom"

                           - Blues In Britain Magazine

Kirk and his 'Tweed Bluesman' sound-checking for the gig with Mike Landau in Basel

Sound on Sound magazine reviewed the Onyx Plus

633 Engineering’s Onyx+ is one of the finest amplifiers that I’ve had the pleasure of playing through.........fabulously responsive........wonderful sound
— Sound on Sound magazine review Oct 2015

Read the full review here


Stuart Dixon

633 Engineering Artist Stuart Dixon is currently playing with soul and blues legend Geno Washington. Check out this video of Stuart talking about and playing his Custom 44.   

Stuart Dixon

Stuart talks about his 633 Engineering Custom 44

633 Engineering Twitter Feed