From: jay@west.net   
      
   On 8/10/20 12:37, Dave N. wrote:   
   > I just pick up two Rockola 474's and the one I'm working on has static   
   > in the right speaker all the time sometimes you can hear it over the   
   > music. I have replaced most all of the electrolytic capacitors on the   
   > driver board, the pre amp and the power board with no change in the   
   > noise. has any one ever had this before.   
      
   If you have an oscilloscope you can probe the same points on both   
   channels looking for the noise.   
      
   Otherwise you can narrow it down, does the volume of the static vary   
   with the volume control or is it always at the same volume? Does it go   
   away during scan when the box is muted?   
      
   It's most likely a transistor. Without test equipment you can often   
   narrow it down by temperature. Most noisy components are noisier when   
   warm. Get a can of freeze spray (or computer duster, just turn it   
   upside-down) and give a light spray to each transistor during operation.   
   The one that causes the noise to go away or drop substantially is the   
   culprit.   
      
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