I found an article on the web about changing the bulbs, the author gave me a heads up on where to get replacements, they work on both the MTR-10 and the 5050, 8v lamps from parts express, put them in the 5050, work great, haven't done the MTR-10 yet, boy do I love that machine, so easy to work on and work with, the cue function, memory set, edit/unload, etc. miles above a typical prosumer set...