From: liz@poppyrecords.invalid.invalid   
      
   I was asked to repair a Pioneer QX-949 quadraphonic tuner/amplifier.  It   
   is a complex beast and one channel had gone down to almost nothing.   
   Luckily the service sheet was available and I traced the fault to the   
   board which houses the tone controls and filters.   
      
   The gain is in two stages with the tone controls around the second   
   stage.  On one of the channels, the voltages on the single transistor   
   for that stage were all wrong.  After lifting the transistor off the   
   board, it became apparent that the base bias was far too high and the   
   finger of suspicion pointed to the inter-stage coupling capacitor   
   feeding in leakage current from the preceding stage.   
      
   I tested the capacitor, which was marked "4.7".  It read exactly 4.7k in   
   both directions on an ohm-meter !!!   
      
   --   
   ~ Liz Tuddenham ~   
   (Remove the ".invalid"s and add ".co.uk" to reply)   
   www.poppyrecords.co.uk   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)