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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. Using these original machines, the original components and their “secret processing recipe”, GT was able to authentically reproduce the classic GE power tube. Pittman says, “The 6CA7GE will appeal to players using Marshall EL34-style amps (and the many Marshall impersonators), providing a whole new sonic signature option that will certainly please a wide range of musical playing styles. If I had to simplify the description, the GT6CA7GE is somewhere between a Mullard EL34 and a GE 6L6…more ‘chest' and certainly more power than any EL34 tube. Plus, they are directly interchangeable in all EL34 circuits (with proper rebiasing, as always).
This tube has a bias point between an EL-34 and 6550 (a bit more than a 6L6 actually). It’s power output falls between an EL-34 and 6550. This tube has a true active beam forming element which is not present on the EL-34 which is one of the major differences.
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