About 20 minutes. If they don't sound right after 20 minutes, there's something wrong with one or more of the tubes.
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Could the problem be the sovteks? If you will notice, many manufacturers put sovteks in to keep costs down. However, have you ever seen people "rolling" with them? Yuk! Sorry to say but I think you are doing a great injustice to some nice amps by using those tubes. Yes, I know it's my opinion but I've owned a lot of tubes and never like sovteks. They don't have the detail, warmth, dynamics or build quality of many others out there. That's why they are cheaper than most.
I'm a firm supporter of the Svetlana's - they are a great tube and I have a life time supply ;-), however, since David complains of a lack of dynamics I would suggest that he consider Tesla (NOS) or JJ (New Production) E34L's (which will be biased hotter) or EL34's. They have a much crisper sonic signature than the Svetlana's. But the Svetlana's will be much warmer, my personal preference.