King of the Tube Testers.

With the brains of a computer and the ears of a musician, Robotube runs a battery of seven exacting tests on each power tube and analyzes performance so thoroughly it can even predict the tube´s lifetime. Designed by Mesa Engineering and built for us by an aerospace firm, Robotube is a one-of-a-kind machine and easily the most modern and powerful in the industry.

Precision data generated during the seven-part test procedure is combined in Robotube´s memory and later printed out for each tube. But there are still some factors of tube performance that only a human (with a hammer) can properly analyze. After passing tests for noise and microphonics, then comes the severest mauling of all the MESA hammer test. Here each tube is tested for reliability under sever shock and  vibration....enough to duplicate your amp falling off a six foot stage at full volume!

Compare our guarantee: Six months under Heavy Duty use. That´s twice as long as most. You can find tubes that cost more, but if they worked any better, we´d be using them!