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Burn-in time for a Shuguang 845B tube?

About how many hours does it take to burn-in a Shuguang 845B tube? Can I expect a big change in sound as time goes by? Right now I have logged about 30 hours on a pair of 845s and the sound is still rough in the edges but I like more thant the regulars 845 (not B o C). The tubes are installed on a Bel canto SETi40. Thanks in advance for your comments.
tiofelon

Showing 2 responses by amfibius

amfibius
282 posts
 
I can tell you that my Shuguang 845T's took about 75 hours before they started to open up. By 100 hours they had stopped improving.

I remember when I first dropped them in to the amp. They sounded horrible, and I thought that I had made a serious mistake. They were closed in, sounded muffled, and had poor dynamics and no sparkle. Now they are the opposite - open sounding, dynamic, great sense of scale, and pleasant to listen to.

Keep the faith :) And good luck!
amfibius
282 posts
 
Yeah, the original 845's that came with my amp. But that's not really relevant because the whole amp was burning in at the time.
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