• My ancient quad 33 and 303 is making a ‘tapping’ noise.. quiet, regular popping noise about 4 times a second.. under the music.. remains at constant volume regardless what the music is playing at. Anybody any ideas? Nothing new added to the system (or anywhere else in the house)

  • Could be a cap failing causing the power supply rails to dip. If you disconnect all the inputs do you still hear it?

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