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Where to scavenge mu-metal?

Discussion in 'Electronic Repair' started by SparkyGuy, Apr 11, 2007.

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  1. SparkyGuy

    SparkyGuy Guest

    Is this stuff prolific in old CRT monitors, or TVs? Need about a square foot
    or so...

    Sparky
     
  2. Joerg

    Joerg Guest

    Nope, only in higher-end legacy lab equipment. With legacy I mean >>25
    years old.
     
  3. Wrapped around old oscilloscope tubes.
    I don't think old TVs ever merited its use.
     
  4. Barry Lennox

    Barry Lennox Guest

    Old oscilloscopes or the like would be your best bet for this

    Barry
     
  5. Jim Yanik

    Jim Yanik Guest

    (Andrew Gabriel) wrote in
    TV's used electroMAGNETIC deflection,which overwhelms Earth's field.
    Those big,short TV CRTs just are not as sensitive as a long,narrow
    electrostatic deflection scope CRT.
     
  6. Lamey

    Lamey Guest

    Piss off.
    You got that lawyer yet?
     
  7. Chris Jones

    Chris Jones Guest

    I have vague memories of hearing that if you bend it (or straighten it) then
    it loses its special properties and needs to be re-annealed in some fancy
    vacuum furnace thing or something like that. If you found a weird-shaped
    piece of this stuff inside an old oscilloscope then I I'm not sure that you
    could use it unless you needed it in exactly the shape that you found it
    in.

    There is a German place that sells little mu-metal boxes (cylindrical cans
    actually):
    http://www.buerklin.com/gruppen/KapH/H161260.asp
    and here is some self-adhesive mu-metal foil:
    http://www.buerklin.com/gruppen/KapL/L210600.asp

    Actually I suppose the existence of the mu-metal foil product brings into
    question whether it really matters whether you bend the mu-metal. Perhaps
    someone else knows for certain.

    Chris
     
  8. Bill Janssen

    Bill Janssen Guest

    Look at old oscilloscopes.

    Bill K7NOM
     
  9. Phil Allison

    Phil Allison Guest

    "Joerg"

    ** Where does this jerk off get his weird ideas from ??

    The laws of magnetics have not been repealed in the last 25 years.

    ALL good quality scopes using CRTs have mu-metal shields.

    Even ones made today.




    ......... Phil
     
  10. Joerg

    Joerg Guest

    On flat screen displays? What for? Sorry, but that would be like
    applying sun screen under the swimsuit.

    Note that he wrote he needs a square foot. I've only seen that much in
    really old scopes. Newer CRT versions have a skinny shield right around
    the CRT and that ain't going to be enough to harvest a complete sqft from.
     
  11. Arfa Daily

    Arfa Daily Guest

    Back in the days of 90 degree delta-gun shadowmask tubes, an external
    magnetic shield most certainly was used around the bowl. The degaussing
    coils were usually fixed to it, and it mounted using the same four corner
    bolts as fixed the tube to the cabinet front. Many were my sliced fingers,
    from the razor-sharp edges of these shields, when I was an apprentice
    engaged in replacing these tubes ...

    Arfa
     
  12. Phil Allison

    Phil Allison Guest

    "Joerg"

    ** I said **CRT ** - you FUCKING IDIOT !!!!

    Try learning to read sometime !!!



    ** Cheap Asian made scopes usually have no mu-metal at all, just a tin plate
    ES shield around the neck - so they are highly subject to external AC
    fields.

    More expensive Asian scopes ( ie 60 MHz and up) usually have a mu-metal
    shield on the CRT.

    Examine almost any European, US or Australian made scope and you will find
    it has a full size mu-metal shield -excepting scopes employing PDA (Post
    Deflection Acceleration) where the mag shielding is not needed near the tube
    face.




    ........ Phil
     
  13. MassiveProng

    MassiveProng Guest

    Learn to read, dummy. It says RIGHT THERE 8 lines up... C R T s
    Old 20" CRTs for PCs as well as some TVs have it.
    Then he'll just have to cannibalize two. D'oh!
     
  14. Rich Grise

    Rich Grise Guest

  15. Guest


  16. No, he just can't figure out which of 20 names to use.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  17. John  Larkin

    John Larkin Guest

    Why?

    John
     
  18. You might try your local recycling center to see where thay tear down
    old CRT monitors and TV's. Maybe if they let you come by you can spot some.
    --
    Joe Leikhim K4SAT
    "The RFI-EMI-GUY"©

    "Treason doth never prosper: what's the reason?
    For if it prosper, none dare call it treason."

    "Follow The Money" ;-P
     
  19. Isn't moo metal what they make cow magnets from!
    --
    Joe Leikhim K4SAT
    "The RFI-EMI-GUY"©

    "Treason doth never prosper: what's the reason?
    For if it prosper, none dare call it treason."

    "Follow The Money" ;-P
     
  20. Tim Williams

    Tim Williams Guest

    I used to think so, but when I went to college, I learned that it's made
    from cats!

    Tim
     
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