From: pfjw@aol.com   
      
   On Wednesday, October 19, 2016 at 5:43:10 PM UTC-4, Jim Worthington wrote:   
      
   Please note the interpolations.    
      
   > To start, I'm replacing all of the paper electrolytic and non-electrolytic   
   paper capacitors in the amplifier and will go from there.  I checked the   
   tubes. They're all good, but the 12AX7s are a little low on emission.  The   
   power cord is frayed.  I'm    
   going to replace this with a 3-wire power cord.   
       
   Before you do this, make sure that the chassis is actually fully isolated - no   
   fault in the transformer and that this is not a transformerless design.   
   Unlikely, but with this sort of thing, adding a 3-wire cord can sometimes have   
   untoward results. If    
   there are line-bypass caps in place, be even more careful, and replace them   
   with properly rated (X or Y) type caps. And check for hum loops after   
   installation. Unlikely, but worth attention.    
      
   > The electrolytic capacitors in the crossover network will probably have to   
   be replaced as well.  I'm concerned that Polarized electrolytic capacitors   
   were used in the original design instead of non-polarized capacitors.  This is   
   not good design    
   practice.  Reverse voltage on an electrolytic capacitor can damage the   
   capacitor.   
      
   The original design likely upped the voltage to avoid the need/cost of NP   
   caps, which were relatively more expensive back in the day. Certainly more   
   costly than going up on voltage. In any case, shifting to NP caps can only   
   make it more stable and will    
   do no harm.    
      
   > The motor is frozen on the turntable.  Removing the dried out grease and   
   lubricating should fix the problem.  The rubber roller may need to be   
   replaced.  I'm also looking for a replacement for the original Collaro RC456   
   changer as another possibility.     
   Modern turntables should provide less wear on the vinyl media.   
      
   You can "restore" an existing dried out roller by lightly machining a groove   
   into the existing hard roller - if it still has its integrity, that is - and   
   then use a neoprene or silicon O-ring of the appropriate size secured with   
   super-glue. It is only an    
   idler, after all. I find that synthetic greases are very good for lubrication   
   where no slop is required:   
      
   http://www.mscdirect.com/product/details/00257006      
      
   You will likely have to replace the cartridge and stylus - there are many   
   sources for such    
      
   Good luck with it!    
      
   Peter Wieck   
   Melrose Park, PA    
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)