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unkown board on 2220b

  1. soundguy9

    marantz 2220B with an additional strange board!

    Hello All, I recently recapped my beloved 2220B and let me tell you what a learning experience it was. Finally, after adjusting power supply, bias and DC offset voltages it sounds just as good as before it was recapped IMO. But ofcourse, it is a reliable unit for many years to come. In the...
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