I have an MC-2500 that I bought new in 81 along with a C33 pre amp. They have been the base for verious pieces of equipment over the years that have come and gone. The C33 had a tune up a few years back, but no probblems, and to my ears they still sound very good. They are hooked to a pair of Electro Voice Sentry 3 speakers and they will shake the house.---Ken.