Audio Research tube grading

Tubes Asylum

Questions about tubes and gear that glows. FAQ

Hi. Due to my new found ARC fetish, I have a bunch of ARC supplied Sovtek and EH 6922s. Almost all of them have some kind of round circle drawn between the pins. Red, green, blue and dark blue.
Do these colors mean anything? Some kind of grading system at ARC?
Thanks in advance.

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Kimber Kable

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

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

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