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Tandberg 641x intermittent static pops

Discussion in 'Tape' started by Murrtallica, Jan 27, 2018.

  1. Murrtallica

    Murrtallica New Member

    Messages:
    4
    I've got a 641x that i got up and running a year or so ago, but haven't used it much since it generates static pops during playback. It isn't a constant static, but more like an intermittent pop, similar to a record pop. It can be heard in this video: (mostly in the right channel in this case)

    I'm not very well versed in the workings of tube reel to reels, so I have no idea how to fix this issue. Any help would be greatly appreciated!
     

     

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  2. oldvinyldude

    oldvinyldude AK Subscriber Subscriber

    Messages:
    1,646
    Location:
    Buckeystown Maryland
    I am interested in what other's suggest too. I have a receiver that exhibits similar behavior-think it might be a cap issue, but hopefully, more knowledgeable folks will enlighten us both :confused:
     
  3. prabie

    prabie Member

    Messages:
    80
    Location:
    Santiago, Chile
    I wasn't able of hearing any pops
     
  4. sixthday

    sixthday Super Member

    Messages:
    1,288
    I had a similar issue with my 64. It turns out the wires are loose. Re-solder it solve the problem. Try slightly touch/move those wires, if you hear the pop then you have loose solder points for that wire.

    Also, loose tube feet can also cause this. Same, touch the tube and see if you hear anything.
     
  5. Murrtallica

    Murrtallica New Member

    Messages:
    4
    Poked around the tubes and didn't stir a reaction, same with wires. Anywhere specific I should look wire wise? Maybe I didn't move the ones that could be causing an issue.
     
  6. sixthday

    sixthday Super Member

    Messages:
    1,288
    If that does not identify the issue, then you may have some falling caps/resistors etc. and I will suggest send for professional servicing because you may need to read the schematics and use a score to check the audio route.
     

     

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  7. Murrtallica

    Murrtallica New Member

    Messages:
    4
    That's probably a good idea. What's odd about it is it seems to only happen like that at the head and tail of the tape. It virtually stops once the tape is a decent way through.
     
  8. jdurbin1

    jdurbin1 Tandberg enthusiast Subscriber

    Messages:
    8,884
    Location:
    San Diego
    Maybe static discharge when the reel rotational speed is higher at either end?

    John
     
  9. Murrtallica

    Murrtallica New Member

    Messages:
    4
    That’s definitely a possibility. I live in a dry environment so static is always an issue here. My Teac 3300 seems to handle it fine, so I’m guessing the Tandberg doesn’t have a way to combat it from appearing.
     
  10. jdurbin1

    jdurbin1 Tandberg enthusiast Subscriber

    Messages:
    8,884
    Location:
    San Diego
    Or the way it was designed to combat static is currently failing due to age or buildup of crud or other reasons. The service manual probably will answer that, with a little study...

    John
     
  11. apachef1

    apachef1 Well-Known Member

    Messages:
    881
    Location:
    Southbury CT
    Check any ground wires associated with the head block, I had the same issue with a Studer and it turned out to be a ground wire connection on he block.
     

     

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