Phaez Amplification is a boutique tube amplifier builder based in Windsor, Ontario, Canada, founded and operated by Randy Fay. The brand's name is derived from "Fay's," and Fay has been constructing hand-wired, point-to-point tube guitar amplifiers since the early 1990s. Phaez amps are built to order in small batches, with an emphasis on affordable boutique pricing relative to other hand-wired offerings.

The lineup includes a wide range of original designs as well as takes on classic British and American circuits. Notable models include the Daisycutter, McClane, Cheyenne, Crocodile, Barracuda, CLEO, Triple F, The 1966 (a JTM-style build), and The Guillotine. Output tube configurations span EL84, EL34, 6V6, 6L6, and KT88 variants across roughly 18W to 70W+ power ratings, and customers can commission custom specifications and cosmetics.

Phaez has developed a following on guitar communities such as My Les Paul Forum and The Gear Page, where Randy Fay (also known online as "ontariomaximus") has documented many of his builds. Amps are sold direct from the builder and frequently appear on the secondhand market through platforms like Reverb.

Phaez has 1 product cataloged on Equipboard, including Guitar Amplifier Heads.