Due to room accoustics my right speaker is louder in my listening position than the left, I use the balance, would prefer a better room but the balance works.
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I'd suggest following Davt's lead and look at your room configuration. Asymmetry can be a problem, especially with speakers that have a wide dispersion in rooms where the primary reflection points are different from the left side to the right. That can really skew the stereo image.
If that's the source of your problem it can often be improved by experimenting with speaker placement in the room and acoustic treatments.
Have those new tubes tested with a tube tester(unless they were already tested/matched to begin with). The transconductance of your tubes for the right and left channels in your preamp and/or amp might indicate a considerable difference or mismatch. If this is the case it might explain the difference in perceived output you hear between the right and left channels. This is not an uncommon occurence.
A quick way to check if it is the tubes, assuming biasing et al is not fast and easy, just switch the speaker cables at the amp (only) and obviously just for testing. If it is the tubes, the opposite speaker will start sounding louder. If not, it sounds like it is a room placement/acoustic issue. Of course, it is assumed that the speakers (cross-overs) are not presenting the issue and that you already checked this.