The ARC amps I have had sound good right on start up and after around half hour they are all set.
Tubes last around 2000 hours and little maintenance other than biasing tubes when they are new and maybe checking them once a year.
They are wonderful amps the new Ref series are phenomenal.
Good luck.
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VPI Scoutmaster; JMW-9 Signature; Shelter 7000
Bryston BDA2 + BDP2; ARC PH5; ARC Ref 5; ARC Ref 150, Equi=Tech Son of Q
Wilson Sophia 3; Transparent - cables
XLO - cables; Aural Symphonics - cords; Shunyata - cords
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