In most all, well designed tube equipment, the tube is the most critical element.What tube to use, is wholly dependent, on your tastes, and compatibility. AI's are rather hard on tubes, so a premium NOS could be an expensive proposition.The ruggedized tubes, are always the military tubes.By rolling tubes, you can tailor the sound to the limits of the gear. Yes, it worth it , sonic wise.Now you have to decide, if it worth it, pocket wise.
