Yes indeed. I have actually built a few tube guitar amps for fun. I did the designs myself and the first one produced so much noise/hum that it was practically

Yes indeed. I have actually built a few tube guitar amps for fun. I did the designs myself and the first one produced so much noise/hum that it was practically unusable. Twisted pair wiring, careful routing of grounds, transformer location and component selection all seem to play massive roles. No wonder then that most amps these days are built around transistors, even though they sounds worse...