Yz_yang, you provided a lot of good information there, thank you!
I believe the DA50S should be able to run EL34/6CA7/KT77 tube variants without issue. Though it and the DA88S were featured with KT88 output tubes, I think, like the other cathode bias Jadis integrateds, running the smaller tubes would be no problem. If you have doubts, I can check with my friend, who is one of the principals at Jadis, and will provide the definitive answer.
Personally, in my DA30 and DA60, I very much prefer the EL34 over the 6550/KT88/KT90.
I believe the DA50S should be able to run EL34/6CA7/KT77 tube variants without issue. Though it and the DA88S were featured with KT88 output tubes, I think, like the other cathode bias Jadis integrateds, running the smaller tubes would be no problem. If you have doubts, I can check with my friend, who is one of the principals at Jadis, and will provide the definitive answer.
Personally, in my DA30 and DA60, I very much prefer the EL34 over the 6550/KT88/KT90.