The tubes in the Crimson 275 are warranted for five years. Our competitors give three months. Prima Luna, an excellent product, gives six months. The tube checker is built into the amplifier. You can check your neighbors' tubes at full operating parameters. We've given out between three and 10 tubes in the last 10 years depending on who you speak to. On this model tube life would be about 20 years. It's even greater on our more expensive amplifiers (and their extended warranties reflect this) but we run the KT 120s a bit harder in order to come up with 90 W per channel which every 275 is capable of. We have no service department because we have no failures. The 275, like all of our amplifiers, repairs defective tubes if the malady, the most common, is caused by impurities. We vaporize the impurity, sacrifice a dedicated fuse, and you're back in business.
Frank Malitz CEO
The Bob Carver company