Tube Research Labs

About Tube Research Labs

Tube Research Labs (TRL) is a specialized HiFi audio manufacturer renowned for producing high-end, handcrafted tube amplifiers and preamplifiers. Founded by Paul Weitzel, TRL has earned a reputation among audiophiles for designing amplifiers featuring unique, minimalist circuits—such as the celebrated Dude preamp and the Golden Triode Reference mono amplifiers—that emphasize musicality, high power output, and zero negative feedback designs. TRL's products are known for their robust build quality and are favored by enthusiasts seeking premium sound performance. Despite acclaim in some circles, the brand has faced controversy regarding customer support.