BOSE4401 - The new BComponents (a.k.a.Vishay) reservoir
capacitors for the power supply. These are 2200µF / 35V low ESR
for better PSRR and faster power supply response. Original were only
1000µF noname caps and 30 years old. Above improved reliability, reason of this upgrade is to provide smoother and
faster output the preamp's power rails.
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