Does anyone have any ideas?

Thanks very much, I hope to join in the dissuasions on the forums. :) It happens to both channels, I don't have an oscilloscope, nor the technical know-how to trace the fault. I may have to consault one of my friends! I don't suppose there would be a replaceable component? I can de-solder and re-solder easly. It was suggested to me that I should

Recently my cherished BeoMaster 3000 has been popping and cracking. If I’m using Phono or Tape input and its been on for about 10 minutes (enough time to heat up) it will start popping and eventually gets unlistenable. If i put the unit into standby for a while and then back on it will still be popping but after a while unlistenable again. Interestingly