Got the answer

Tubes Asylum

Questions about tubes and gear that glows. FAQ

In Reply to: Audio Research tube grading posted by Gofast on April 21, 2007 at 20:05:49:

Got the answers - they grade by transconductance:
Black: lowest - cathode followers
Red: Medium
Blue and green are basically the same
Green: Current color for high transconductance
Blue: Old color for high transconducatance.
Hopefully this will be of interest to someone in the future.
They do not grade for noise.

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Follow Ups Full Thread

Topic - Audio Research tube grading - Gofast 20:05:49 04/21/07 (1)

Got the answer - Gofast 07:52:32 04/23/07 (0)

Follow Ups

Got the answer - Gofast 07:52:32 04/23/07 (0)

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