• Almost ALWAYS due to removing a black grounding wire. - Bill Thomas 16:37:50 07/10/09 (4)
  In Reply to: RE: Pas 3x removed loudness and now humming posted by TubeGrashopr on July 10, 2009 at 14:36:46

  When tinkering around the Volume Control, you really have to be careful to make SURE you keep the black ground wires intact. If one winds up becoming disconnected, you will have nothing but hum.
  
  I hope this puts you on the right track. Let us know what you find.
  
  Bill
  

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  • RE: Almost ALWAYS due to removing a black grounding wire. - Tubegrashopr 09:39:25 07/11/09 (2)
    In Reply to: RE: Almost ALWAYS due to removing a black grounding wire. posted by Bill Thomas on July 10, 2009 at 16:37:50

    I figured it out the two ground pins on the volume switch were not connected to each other. Thanks for the heads up Bill. The volume switch still only really seems to be usable in the 10:00 - 1:00 position though. Which is better alps or dynaco replacement?
    

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    • I'd go with an Alps 100K pot. - Bill Thomas 14:06:21 07/11/09 (1)
      In Reply to: RE: Almost ALWAYS due to removing a black grounding wire. posted by Tubegrashopr on July 11, 2009 at 09:39:25

      The version sold by Radio Shack has a loudness tap as well. Unfortunately, you *may* have to buy several to find one that tracks similarly between sections. (Of course, if you have a "friend" at Radio Shack, he *might* let you try several and bring back the ones that don't track correctly.
      
      Hope this helps.
      
      (I'm REALLY glad you found the problem! Good work!)
      
      Bill
      

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      • RE: I'd go with an Alps 100K pot. - Tubegrashopr 18:18:42 07/11/09 (0)
        In Reply to: RE: I'd go with an Alps 100K pot. posted by Bill Thomas on July 11, 2009 at 14:06:21

        Well I purchased and installed the radio shack 100k pot. I saw the loudness taps and tested them with and without the resistors and decided to leave the resistors on. The sound is B -E- A-utiful!! The channels have never tracked so well nor has the volume control been so nice and even throughout the entire range. I've been at this thing solid the past two days and its a real treat to have it working right. Thanks again for the solid advice Bill!!
        -Patrick
        

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  • RE: Almost ALWAYS due to removing a black grounding wire. - TubeGrashopr 19:52:57 07/10/09 (0)
    In Reply to: RE: Almost ALWAYS due to removing a black grounding wire. posted by Bill Thomas on July 10, 2009 at 16:37:50

    I disconnected one of those ground wires temporarily but I remembered to reconnect it. I tried taking the two wires and two caps off the taps on the volume control and tested it, it hummed. Then I put the 4.7k resistors in as suggested in the writeup and still hummed. I guess I'll just have to play some more with it.
    

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