Sonic Frontier Power 1 Tubes

I've put in JJ-Tesla KT-88's and I like them a lot. Today, I replaced the stock Sovtek 6922's with EH 6922 Gold Pins and so far I hate them. It sounds like I have blankets on my speakers. Do input tubes require some break in time?

Update... The EH 6922's are sounding better after about 10 hours of use. I'm starting to like them (or am I getting used to them?). The bass response from the get-go has been excellent, but the midband seemed collapsed initially. Today midrange seems much better. Later this week, I'll swap the old Sovtek's back in and we'll see what happens.

Tom

After much playing around, I am happy with the EH tubes. They've come around nicely. The main difference between these and the Sovtek's I replaced is bass response.

I've heard that tubes require some break-in time, but this is the first time I really noticed it.

Tom