What is the break-in time for a NOS Tung-Sol 6550? I wanted to see if a NOS grey-plate, Tung-Sol
6550 would be an improvement to replace the original Sovtek 6550 I was using in my ARC
Ref 6. When I first put it in the sound
was bright and edgy—not the least bit musical.
Someone in this forum mentioned that these tubes take 200 hours to break
in. So—I actually took the time to keep
it in my system for what is now about 100 hours, and I did notice a big
difference. The midrange was improved,
with a sweeter, richer sound. It is now
at the point where this tube is acceptable—but there is still a trade off when
compared to the Sovtek. The Tung-Sol
has a deeper, tighter bass, more extended highs and a decent mid-range. Overall, there is more detail—a cleaner
sound. However, the Sovtek has a much
fuller sound with a rich, sweet midrange—but not as open. I am still not completely sold on the
Tung-Sol, despite the big improvement when it had more break-in time on
it. My question now is--will the additional
100 hours of break-in time make that much more of a difference in creating a
warmer, richer sound?