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31 Mar 2020

Bose 4401 solid state preamp reconditioned



This is one of the best sounding vintage preamp I've ever heard after a little tweaking!!!!!
it is a rare 4channel preamplifier with a superb sound  just after few mod!
At first heard it was really good sounding but just a tad bassy and muddy.....
....just cleaning all selectors , taking care of all weld joint and swapped several electrolitics cap with sanyo  oscon and polypropylene the sound turn to MAGIC!!!!!!

















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