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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 4 responses by tiofelon

tiofelon OP
59 posts
 
Thanks Brf! I guess I still have to be take easy. Thanks for the advice about no letting the amp unattended.
tiofelon OP
59 posts
 
Well I just past the 50 hr mark and the sound started to open up, the rought edges are (almost) gone, but I think the biggest improvement is in the soundstage area! The music is wide, tall and deep as it suppose to be! I guess a few more hours should bring more detail and smooth the music a little bit. Thank you all for your comments!
tiofelon OP
59 posts
 
Amfibius,

Besides the Shuguang 845 T tubes do you any experience with some others 845 tubes burn in time?
tiofelon OP
59 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.
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