ModWright LLC, also known as ModWright Instruments, is a maker of of tube electronics and capacitors for end users to modify certain other products for better sound quality.
Founded by Dan Wright in 2000, ModWright soon started manufacturing preamps and eventually amplifiers.
Notable ModWright products include:
ModWright 9.0 Series of preamps
ModWright LS 36.5 tube line stage
ModWright KWA 150 amp
Not forgetting their modding roots, ModWright has mods for the Oppo BDP-83 and BDP-83SE and the Sony XA-5400ES.