daveyf, 1) the warranty varies depending on the model. The output transformers are guaranteed for life. The problems you are referring to were mostly associated with manual bias defy 7 (often caused by bad tube rolling and improper biasing), and blown fuses on the old JA200. All other amps never had problems and the preamps have always been dead reliable. New stuff is literally bullet proof. I never had any problems whatsoever, even with accidentally shorted outputs or failed tubes.
2) JA30 do not give off much heat - as you know, there are only 2 output tubes per mono block.
2) JA30 do not give off much heat - as you know, there are only 2 output tubes per mono block.