For a more professional sound you can replace the cheap tubes that often come in consumer level audio gear (such as mic preamps) with some NOS tubes.
What is NOS? It means "New Old Stock." Basically the idea being that the new tubes being made today are crap, so you're better off buying a refurbished older tube.
When shopping for tubes make sure you get the right kind that fits well with your gear. 12AX7 is the most common type of tube used in audio gear.
Buy NOS Tubes Online
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 2 NOS 6DQ5 Vacuum Tubes for Hallicrafters Hammarlund  US $10.50
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 2 NOS RCA 6146B 8298A Radio Vacuum Tubes 27 Watts US $26.50
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 Matched quad 6BQ5 EL84 vacuum tubes test 90 of NOS US $11.99
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 FOUR NOS VACUUM TUBES 6BQ5 EL84 US $20.50
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 SEVEN NOS VACUUM TUBES 6 1U5 AND 1 3V4 US $7.95
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 TWO NOS VACUUM TUBES SYLVANIA 6922 US $9.95
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