Copland CTA402 Integrated Amp


My amp is sounding a little stronger on the right side than the left. The balance control is at the center. Could it be that one of the tubes are burning a little brighter than the others (especially the two right ones)? If yes, any suggestions on how to bias these tubes? Thank you in advance for your responses.
proac1
Does anybody know if the Copland CTA 402 can be used as a preamp? I am looking to purchase a pair of monoblocks but want to hold off on getting a preamp at this time.
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