Lerxst is a guitar amplification and effects brand founded by Rush guitarist Alex Lifeson in partnership with North Carolina-based amp builder Mojotone. The name comes from Lifeson's long-standing nickname within the band, and the company designs and hand-builds its products at Mojotone's factory in Burgaw, North Carolina. The line is positioned as a reflection of Lifeson's tonal approach developed over decades of studio and live work with Rush.

The flagship Omega is a high-gain amplifier head modeled on a vintage Marshall that Lifeson used during the recording of Rush's Clockwork Angels album, and it is also offered in a hand-wired Special Edition version. The smaller-format CHI is a 30-watt 6L6-based amplifier available as both a small-box head and a 1x12 combo. The catalog also includes matching guitar cabinets, the By-Tor overdrive pedal, and the Blah Blah Wah. A signature Grace electric guitar has been released in collaboration with Godin, and Lerxst has issued limited R50 editions tied to Rush's 50th-anniversary celebrations.

Lerxst amps are marketed for players seeking a platform that covers clean tones through saturated, arena-style gain, with features such as power-scaling and serial effects loops. The brand's audience is largely made up of Rush fans and players interested in Lifeson's signature sounds, and it sits in the boutique U.S.-built tube amp segment alongside Mojotone's other hand-wired offerings.

Lerxst has 9 products cataloged on Equipboard, including Guitar Amplifier Heads, Overdrive Effects Pedals, and Fuzz Effects Pedals. Their gear is featured by 1 artist, with the strongest followings in Rock. Notable users include Alex Lifeson.