What does JAN mean on a tube designation?
Joint Army Navy — tubes selected for their ability to withstand the shock & jarring of ’50s/’60s military equipment with a lower than average failure rate. -David R. Bucholz • What power plug do I need in [some country]? • On the power plug, which prong goes to what? You can find lots of information on this topic at http://www.kropla.com/electric2.htm . Thanks to Bill Kahle for pointing out this link! • Do I really need Groove Tubes? That depends on what you want to do. If you are happy with the sound of your amp, and it has Groove Tubes, you can drop in a “matching” GT set and have a good chance things will sound fairly close and not blow up. On the other hand, there are alternatives (see next question) you may wish to consider. Groove Tubes works hard to select and match tubes, but the fact is that tubes that test the same may sound different, and replacing output tubes without rebiasing always carries a certain amount of risk. GT can reduce that risk, but never eliminate it entirel
