Question about NAD C320 2-Channel Amplifier
You need to check around the output stages for dry solder joints. Then also replace the BD139 bias control transistor on the heatsink with a 2sd669. The BD139 can be prone to thermal runaway in this circuit Then setup the bias current and DC offset in the output stage. If you are not familiar with the things that I have just told you, you need to contact a technician, if you mention these things to him, then you stand a fair chance of getting it sorted out.
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Posted on Jul 27, 2008
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Posted on Jan 02, 2017
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