Groove Tubes Substi-Tubes allow the replacement of octal-type preamp tubes with the more common and higher quality 9-pin miniatures by properly mating a female 9-pin socket to an 8-pin plug. Includes GT-12AX7 tube. day warranty on power tubes, includes replacement of whole set if one tube goes bad. day warranty for preamp tubes. 3 year warranty on SubstiTubes and Solid State Rectifier. Check with M-Audio for warranty on GT microphones.
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