Amplifier hum troubleshooting

Dec 02, 2019 · There is nothing worse during a quiet piece of classical music, or silent pause, to have amplifier hum & the fact your 520 was silent should be suffient proof that it is not your mains supply. Speak to Quad service department & if they cannot resolve the problem, demand you money back from the dealer. The symptoms of a ground loop, ground noise and hum in electrical equipment, are caused by current flowing in the ground or shield conductor of a cable. Fig. 1 shows a signal cable S linking two electronic components, including the typical line driver and receiver amplifiers (triangles).

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Occasionally amplifiers can exhibit a 50 Hz audible humming, which in electronics is a noise component within the amplifier circuit. To troubleshoot this issue you have to determine the source of the noise.

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This amp had the following problems:--good tone for 5 minutes, then a nasty, harsh clipping distortion on louder notes (yep, bad tubes were the cause.)--Nasty hum (filter caps and routing problems.)--Dull, muddy tone (needed new caps and tubes.) --The original two-prong power cord needed replacing. If your stereo or video system has a hum or buzz coming from the loudspeakers, there are several easy steps you can take to discover what the cause and cure will be.

Sep 02, 2020 · Follow the steps below to troubleshoot this issue. IMPORTANT: All the speakers connected to the receiver must be rated at 8 ohms or higher. If model-specific information is required to complete any of the steps in this solution, refer to the operating instructions supplied with the product. Manuals are posted on your model support page. Aug 21, 2019 · NOTE: Additional troubleshooting steps are available to troubleshoot instances when the audio, video, or both goes out when using an HDMI connection. Verify the DEMO (demonstration) mode is not active. Change the ATT (attenuate) setting. NOTE: The procedure to change the ATT feature varies by model. Reset the A/V receiver back to factory ...

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