From: bobf.at.mrp3.dot.com@example.invalid   
      
   On 10/23/22 09:03, Rafael Ayala wrote:   
   > I have a Wurlitzer 3200 jukebox, I hear sound but not coming out of   
   speakers. Help!   
   >   
   > It suddenly stopped working. Does anyone know why it would just stop   
   working? is it the amp fuse? it is the wires connected to the arm/needle? I   
   checked over and over and cant seem to find the issue.   
   >   
   > Any suggestion would help. Thank you!   
   >   
      
   from a year ago... still when you have a major loss of function, check   
   the power supply first.  Multi-winding transformers may allow some but   
   not all things to work.  So lighrs and tube filaments may come on (as an   
   example with tube gear) bur no sound.   
      
   For a tube system you could do a simple test by removing the output   
   tubes (put them back exactly where they were) and check for DC voltage   
   on each pin at the socket in the 400V range (to the chassis) with the   
   power on.  If present, might be pre-amp [unlikely] or phase splitter   
   tube (even more unlikely) but usually you'll see very small or even   
   negative voltages (less than 100V) if the power supply is blown.   
      
   Once you have the faulty function, you can then go for the actual cause.   
     Presence of good power means the amplifier has one or more bad   
   components.  Blown output transformer usually has one side still working   
   in push-pull circuits, but if both sides are gone and there are no   
   screen taps, you will see voltage but get no sound (or really distorted   
   sound if one or more screem taps still conduct).   
      
      
   Solid state gear is possibly more difficult, depending on the design.   
   But you can check for volts on the collectors of output transistors,   
   which typically have collector volts on the can.  Do not short it to the   
   chassis or heat sink if there is a can or chassis mount.   
      
   Anyway good luck.  Identify the faulty subsystem first (power supply,   
   preamp, power amp) and then isolate it to narrow down to faulty components.   
      
   Simple volt meter should get you that far, then you can scope it or   
   trace the signal some other way.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)