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Here is the conceptual diagram. Web i have one thing for you to check out, which has been a problem on 3 nad units i have worked on. Web troubleshooting guide connect ac cord from d3020 check the led control circuit is the amber led lighted?
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But the exclusive nad impedance selector. Set it according to the output level of your phono pickup cartridge. Web aug 9, 2014.
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Web this preamplifier circuit with two transistors. It can extend the signal strength max. Web the 7140, like all nad amplifiers and receivers, is designed to deliver its maximum power into low impedances of 4 or even 2 ohms.