Blue Circle audio gear & Gilbert Yeung Designs Forum

:shock: that’s one hefty looking unit!! Biff Your AG8100 shares some very similar design with the NSI. Remember when I wanted to go as far as you would let me with your AG8100 earlier this year. I was designing, building, testing and back to drawing boarding on the NSI along side with your AG8100. ...

that’s one hefty looking unit!!

I recently changed the tubes in my ag3000 pre and tube in my ag8100 amp with gold lion ec88/6922’s.
The difference was far more obvious in the pre than the amp.
So far they seem to be great sounding tubes, they might be worth a try in your ag8000’s