it depends more on the product. also most preamps use smaller less expensive tubes. my preamp has used the same tubes for 4 years and i leave it on as i do my tube amps 24/7. i have never lost a tube in my preamp, but i have lost 3 or four tubes in my amps in 6 years. if i was using krell amps i would find something very soft sounding to smooth out the krell.good luck kirk.
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