Great to hear that you are so satisfied with the Shuguang 2a3c-t. According to all the POST regards this tube I could
find, and that's quite few, your have the most inspiring.
I suppose you have the same set, so reliability should not be an issue.
Are you listening to a wider range of different music, on these tubes ??
Or is your music taste more into certain catagories ???
Which brand of driver tube, are you Using. I Like the OLD STOCK way better than the new (Tung-sol TJ Full Music) I have listened to.
Excuse me, but I'm very curious :-)
PS! A picture of my 2a3 AMP from my friend, he is a danish tube builder. Without any coupling caps (DC) in the signal path.