Factory tubes are not always the best sounding. The best thing IMO is to experiment some with 12AU7s or 12AU7As that you can afford and compare. (With tubes, price does not always equate to sound.) You might also want to jump on tubes asylum (audioasylum.com) and do a search for your preamp. It's a popular piece, and you should be able to get some good info on what tubes work well in it.
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