Set up in 1995, Tonglu Valves Manufactring Co.,Ltd. is one of the leading China groove tube manufacturer and supplier in Yongjia County of Zhejiang Province. We manufacture all products strictly conforming to the API, JIS, ANSI, BS, GB, NF and DIN standards. Our oem groove tubes are available to users on request and are used for municipal works, petroleum, chemical industry, power station, metallurgy, national defense, and scientific research fields.

Font face=Arial, Helvetica size=-1 New tube from Russia. Slightly brighter and lower gain, quicker compression than GT 12AX7. Great for most Fenders, may not be well suited for high gain Fender type amps (such as Boogie). The Groove Tubes Warranty Preamp tubes: Warrented to be free of burn out, excessive noise or microphonics for 180 day from date of purchase. Power tubes: Warranted to be free of burn out for 90 days from date of purchase. If one tube fails, the whole set will be replaced to insure proper matching. GT-Solid Rectifiers & Substi-tubes: Warranted for 3 year
Using these original machines, the original components and their secret processing recipe, GT was able to authentically reproduce the classic GE power tube. This tube delivers rich, harmonically complex tone and midrange warmth that is just not available in any other currently manufactured tube today.

Includes GT-12AX7 tube and 8-to-9 pin adapter. Easy install. 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. The GT6CA7GE is the classic American-style EL34 tube made in the exact likeness of the famed General Electric 6CA7 tube of the 60's. This was the tube we sold to Eddie Van Halen for his Marshalls used on the first two Van Halen albums (often cited for his best tone on record). The Groove Tubes 6CA7GE is a USA-style power pentode tube with similar specifications to the European style EL34 tube. However, the 6CA7 differs in design from the common EL34 types by the use of an active beam-forming electrode similar to that of the 6L6 and 6550. Groove Tubes purchased the actual GE production formulas, along with many of the original General Electric machines and vintage Plate materials via the closing of the GE tube factory several years ago.

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