Hello Audiolabyrinth :-)
I was not aware that 6H30 DR could sound as 12AX7 or 12AU7 when I bought the Ayon. I had a small stock of NOS 12AX7 and 12AU7 in the past, and was pleased to play with them. According to my experience I would say 6H30 are better for soundstage and micro dynamics, but not so much for sound, I think they are more neutral. But when very well optimized like in the Ayon, yes it looks like other NOS preamp tubes :-)
I received at last my Russian 6C4P, so I could open the Ayon to replace the chineese ones. I Checked on the 6H30 DR tubes and found 9106 and 9107, so I guess they are from 1991. I think the production stopped in 1992-93 and started again in 1999 but not with the same quality. I found strange that only the date is written in black when other inscriptions are white on the tube. They are real 6H30-DR but sincerely I'm suspicious about the date.
Anyway they sound fine :-)
I was not aware that 6H30 DR could sound as 12AX7 or 12AU7 when I bought the Ayon. I had a small stock of NOS 12AX7 and 12AU7 in the past, and was pleased to play with them. According to my experience I would say 6H30 are better for soundstage and micro dynamics, but not so much for sound, I think they are more neutral. But when very well optimized like in the Ayon, yes it looks like other NOS preamp tubes :-)
I received at last my Russian 6C4P, so I could open the Ayon to replace the chineese ones. I Checked on the 6H30 DR tubes and found 9106 and 9107, so I guess they are from 1991. I think the production stopped in 1992-93 and started again in 1999 but not with the same quality. I found strange that only the date is written in black when other inscriptions are white on the tube. They are real 6H30-DR but sincerely I'm suspicious about the date.
Anyway they sound fine :-)