2. amps-preamps
  3. 147172-1590

300b tubes burn in time?

I just bought a new pair of Shuguang Black Treasure tubes. For some reason they don't sound as good (open, detailed, life-like) as my old ones of the same brand. 
Do you know how many hours 300b tubes take to fully burn in?

Or I am wondering if I got some sub-par pair of tubes.
essrand

Showing 1 response by elevick

elevick
2,439 posts
 
Maybe it wasn't your output tubes that needed replaced?  Have you checked the gain or other tubes?  A worn out 12 series will make the 300b sound flat.  These shouldn't need burn in at all.
Also, have you checked your bias?
More to discover