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Groove Tubes |
see: Fender Tubes |
Groove Tubes has been in the Guitar tube business for over 22 years. The company started in a garage and is now multi-national. One of the inventions that have come from them is the Speaker Emulator which is a circuit that lets you connect the output of an amp directly to a PA or mixing board. The Groove Tubes has created a rating system that allows you to select how "HOT" of a tube you want. The rating is based upon gain to distortion ratio. A "1" means you get distortion sooner while turning up the volume. A "10" means you get a very clean tone. Rating numbers 8 -> 10 are mainly for bass guitar and keyboards amps. For Marshall and Fender amps a rating of 2, 3, or 4 are probably what you want. Again the scale is 1=Distortion -> 10=Clean. The reason for so many rating numbers is the amount of headroom and dynamic range that the tube will put out. For instance a rating 4 tube will have more headroom and be better for all around playing, Clean and Overdriven. A rating of "5", "6", and "7" are for more gain and lesser amount of distortion. Each tube is measured and rated at the factory on a point scale of 1 to 100. For tube duets, quartets, and sextets each tube is matched to this point system so you end up with a better more predictable sound. No dead spots/frets or notes. GT rejects quite a number of tubes just because they have leakage problems or just don't sound good. This is the reason they sound the way they do. It's worth the price to have someone go through the thousands of tubes and sort them out. All three of my amps have Groove Tubes in them. I've used them for years now without any problem. My latest amp is a THD Univalve and I'm using one of their 6550's in it, truly a great sound :^) These tubes can replace almost any tube you may have in your amp. Some of the amps that Groove Tubes makes replacement tubes for are: Fender, Marshall, Mesa Boogie, THD, Gibson, Budda, Ampeg and many more. Groove Tubes also makes Microphones and Pro Audio Gear as well. An important note on changing power tubes When you change the POWER tubes on your amp, the amp will have to be re-biased. If you've never done it before then it's best to have a service technician bias the tubes. Once they are biased you don't have to re-bias the amp unless you change to a different brand other than Groove Tubes or if you change to a different rating number. Usually there is no need to re-bias preamp tubes; you can just replace them with no problem at all. The Groove Tubes Warranty Preamp tubes: Warranted 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 years from date of purchase. |
| Power Amp Tubes | |
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