Nuzum Amplifier and Music Electronics Repair is a tube amplifier specialist serving the Denver metro area from its location in Black Hawk, Colorado. The shop handles a broad range of instrument and electronics repair work, with a particular focus on the maintenance, repair, and restoration of vintage tube amps. Beyond amp repair, the technician works on Hammond organs, Rhodes pianos, effects pedals and pedalboards, guitar electronics, and electronic keyboards.

For straightforward amplifier repairs — bad input jacks, brittle wiring, factory assembly issues — the shop is known for fast, affordable turnarounds. For more complex jobs, the bench is stocked with both modern and vintage diagnostic tools, along with a wide inventory of replacement parts to keep wait times down. Past projects have included full restorations of Marshall JCM900 heads and antique turntables, giving a sense of the range and depth of work the shop takes on.

Nuzum also offers recording studio services and live sound production. The shop operates by appointment only.