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ValveKing Hum Reduction Modification Cut C139 on the side pointed towards the rear of the amp, leaving as much of the lead intact as possible. Solder a 1C shielded cable to the exposed side of C139 (see picture) and ground the shield, as shown. Cut signal trace to C140/R157/V3,pin 2 on power amp just before reaches any components. RadioFans.CN 收音机爱 好者资料库 Solder the other end of the shielded cable (see picture for length) to C140/R157/V3,pin 2. Remove the shield from the cable on the power amp side. RadioFans.CN 收音机爱 好者资料库
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