Yz_yang, I have received confirmation from Jadis.
You can use EL34, 6CA7, KT88, 6550, KT90, and KT120. He has not tried KT77, so he feels uncomfortable to recommend them. But personally, I use them with no issue.
Many folks are talking about KT120 these days. According to him, they can be used in every Jadis except JA50, JA100 and JA250.
You can use EL34, 6CA7, KT88, 6550, KT90, and KT120. He has not tried KT77, so he feels uncomfortable to recommend them. But personally, I use them with no issue.
Many folks are talking about KT120 these days. According to him, they can be used in every Jadis except JA50, JA100 and JA250.