On Thursday, May 9, 2013 8:17:52 AM UTC-7, John Robertson wrote:   
   > On 05/08/2013 9:13 PM, crumer1@msn.com wrote:   
   >    
   > > Well my wife wanted a Jukebox, so I thought, should not be a big deal to   
   restore one.  :). Its now 2 months later (150+ hours) and there is light at   
   the end of the tunnel, but I'm stuck now and I can't figure it out.   
   >    
   > >   
   >    
   > > The jukebox worked ok (Selector pin, blown speaker, and turn table issues)   
   before I tore her down. I completed all of the basic repairs and all the   
   cosmetics, but did not touch the amp or power distribution unit, since someone   
   had done a basic    
   rebuild on it 10 years. I did change the cable between the amp and power box,   
   because the insulation was breaking inside the cable. Upon reassembly   
   everything works fine except no sound came out of speaker.   
   >    
   > >   
   >    
   > > I found that the RU4 tube does not glow when the record is playing, but   
   all other tubes glow. The start relay works properly and I have around 40vac   
   on one set of contacts and 12vac on the other. Voltages at the RU4 do not seem   
   to change at all when    
   I manually press the start relay and close the contacts.   
   >    
   > >   
   >    
   > > The Schematic says I should be getting high voltages on certain pins of   
   the RU4, but the highest I see is around 40vac, with or without the start   
   relay engaged.   
   >    
   > >   
   >    
   > > I would be greatly appreciative of any help. I wanted to give the Jukebox   
   to my wife for mothers day, but that looks in jeopardy now.   
   >    
   > >   
   >    
   > > Thank you for your time.   
   >    
   > >   
   >    
   > > Clark   
   >    
   > >   
   >    
   > > 925-980-8392   
   >    
   > > crumer1@msn.com   
   >    
   > >   
   >    
   >    
   >    
   > Have you tried another 5U4 tube? It may have an open filament...a tube    
   >    
   > tester is handy here.   
   >    
   >    
   >    
   > Also check that the speaker plug grounds the center tap of the power    
   >    
   > transformer HV windings - this is shown on the amplifier schematics.   
   >    
   >    
   >    
   > John :-#)#   
   >    
   >    
   >    
   > --    
   >    
   >     (Please post followups or tech enquiries to the newsgroup)   
   >    
   >   John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9   
   >    
   >   Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)   
   >    
   >                      www.flippers.com   
   >    
   >        "Old pinballers never die, they just flip out."   
      
   HV center tap off of the red wire from transformer is soldered to ground and   
   measures 0 ohms. The 5U4 filament pins measure 0 ohms not sure if you can   
   measure a tube that way. I ordered a 5U4 wont be in until next week.   
      
   Thank you,   
      
   Clark   
      
   --- SoupGate-Win32 v1.05   
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