All my gear is tubed now. I would not consider going back
Good comments and I can relate with your amplifier transition/progression. I went from a Symphonic Line solid state amplifier to a couple of push-pull tube amplifiers. The el34 amp was utterly reliable. The KT 88/6550 was also, (with the occasional KT 88 failure). 6550 were even less prone to a failure.
Most reliable with zero problems has been my 300b SET of 13 > years. Probably due to the very simple circuit and high built quality. Only 3 tubes per mono block (Rectifier/driver/output). Literally maintenance free with beautiful sound. Tube amplifiers are durable and can be quite trouble free.
Charles