This lets you replace the original underpowered 5B2 bridge rectifier and attached. 022 uf capacitors. You just need to assemble it, which is simple. The 5B2 is used on many pieces of gear, including the Marantz 1030, 1060, 2215, 2220, 2225, 2230, 2235, 2235B, 2245, 4240; Sansui AU-777A, AU-777D, AU-999, Seven, Eight, Eight Deluxe, 4000, QRX-6500, AU-666, AU-7500, AU-9500 (uses two), Yamaha CA-600, CA-600 II, Kenwood KR-5150, Harman-Kardon 75+, and 800+.
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