Bose 4401 // Solid State Stereo Preamplifier | Reverb
Lefson Repair - BOSE-4401 - Solid State Four Channel Preamplifier. Year 1975. We replaced some components, the 4 gang volume potentiometer, and cleaned some contacts. https://www.lefson.com/fr/reparation.php | Facebook
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Bose 4401 Solid State Four Channel Preamplifier Manual | HiFi Engine