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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
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.
brf
1,699 posts
 
My experience has been that the graphite plate 845 take less time to burn in than metal plate 845.
tiofelon OP
47 posts
 
Sorry to hear that! In my case the originals tubes are Sino 845 and the replacements are Shuguang 845B (I guess Shuguang makes them for Sino). So far the difference is notable in all regards: soundstage, bass, definition, etc. I hope that as time goes by the tubes will improve a little more.
bushikai
4 posts
 
Hello, anyone experience with the Shaguang HI-FI model?
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