From: ohg...@gmail.com   
      
   On Friday, September 30, 2022 at 11:12:59 AM UTC-4, JC wrote:   
   > Trevor Wilson wrote:    
   > > I have a Meyer Sound 833 control unit on my bench. It has a weird fault    
   > > that appears to centre around a 15kHz oscillation that affects one    
   > > channel, directly, but is bleeding through to the other channel.    
   > >    
   > > Meyer Sound refuses to supply a schematic. They will repair it for a set    
   > > charge of US$592.50 (nice round figure). That's a bitter pill to    
   > > swallow, but it gets worse. I (and my customer) are here in Australia    
   > > and I figure on the freight charges to blow that figure out to around    
   > > US$1,000.00 or so.    
   > >    
   > > I am hopeful that someone has some experience with this product. Maybe    
   > > even schematics.    
   > >    
   > > TIA    
   > >    
   > > Trevor Wilson    
   > >    
   > >   
   > not familiar with the amp and not an audio guy but:    
   > 15Khz sounds like switching supply noise? Bad caps on power rails?    
   > JC   
      
      
   I thought of and then dismissed that assuming both channels shared a common   
   supply, but I guess there could indeed be a separate converter for each   
   channel.  One thing I've found consistent in consumer electronics is that that   
   lazy electros generally    
   respond to heat and cold.   Warm it up with a heat gun.  Noise gone? Good   
   chance an electro bypass is the cause.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)