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Tube Tone Index
Shop for tubes based on their unique sonic attributes made possible by our Application Grading process.
Experiment. The best part about all this is you do not need a technician to change preamp tubes.
"It was like hearing my amp for the first time."
"My new tubes did more for my sound than all those other new old stock tubes did combined."
"I will never go to those other guys again now that I know about you."
"I can't believe that's the same tube I tried before and didn't like...now it's my favorite!"
"I had no idea that tubes could make such a big difference."
"You ought to charge more for this - this is really great."
"There is no more comprehensive and practical testing done anywhere in the world. All tubes are tested, burned-in, listen-tested, and application graded by me personally."
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