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Does anyone know what the green stuff is on the screws...

Discussion in 'Exclusively Sansui' started by gkargreen, Oct 10, 2018 at 2:39 PM.

  1. gkargreen

    gkargreen Active Member

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    and nuts on these Sansui's? I am guessing not a thread-lock compound, maybe a green lacquer to keep the nuts from coming off? Thanks
     

     

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  2. Ronito6

    Ronito6 Super Member

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  3. satellite

    satellite AK Subscriber Subscriber

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    Maybe a mark to indicate they've been tightened to the proper spec? I've seen that before.
     
  4. DougBrewster

    DougBrewster AK Subscriber Subscriber

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    interference check for warranty purposes
     
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  5. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    I think it probably is thread lock of some kind, it might just be varnish, but its purpose I think is thread locking. With the added benefit as Doug mentioned, that it would also disclose tampering. I've seen thread lock used in electronics assembly many times, and I particularly remember the thread lock we used to use (made by Loctite IIRC) being a dark green colour - it smelled vaguely of solvent, but had an 'earthy' kind of smell. ;)
     
    Last edited: Oct 12, 2018 at 12:55 PM
  6. Gary Francks

    Gary Francks Active Member

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    John, you must be as old as me!
    Many, many years ago when I was in electronics assembly we used the very stuff that the OP talks about but for the life of me I can't remember the name!
    It was a form of varnish IIRC and came in red and green colours and was applied to screws and nuts after fitting up panels etc during mechanical assembly as a form of cheap and easily applied threadlock and to indicate that everything was fitted and checked.
    My heads going to hurt until I remember the name of the stuff we used.
    Smelled like nail varnish.
     
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  7. hugo454

    hugo454 Gold Member Subscriber

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  8. Blue Shadow

    Blue Shadow I gotta get me a new title

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    Thread lock in a apply after type. Jus to hold it a little.

    I use a bottle of nail polish, special color to do this and it identifies my gear so if it is sold on the bay and someone swaps a board...I got picture evidence which the bay would probably need to have notarized with the way they are siding with buyers of vintage gear and their 180-day return option.
     
  9. LBPete

    LBPete Rolling Along Subscriber

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    Japanese manufacturing techniques of that era would often put a dab of paint on critical fastener to indicate they had been tighten. In some cases this step was added during production if inspections or warranty claims indicated a particular fastener was being left loose in production.

    - Pete
     
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  10. avionic

    avionic " Black Knights " Subscriber

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    Magic blue smoke in its solid form..:biggrin:
     
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  11. Pio1980

    Pio1980 AK Member Subscriber

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    Seems right, basically green nail enamel.
     

     

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  12. gkargreen

    gkargreen Active Member

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    Thanks, everyone, that is what I am thinking as well, some kind of nail polish or varnish to hold nuts in place after assembly, I see this stuff all the time in Japanese gear both tube and SS amps/receivers that I have worked on.
     
  13. Pio1980

    Pio1980 AK Member Subscriber

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    I'm also thnking possibly qc inspector checking and sealing satisfactory work.
     
  14. 612electric

    612electric New Member

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    Sounds like loctite , we used to use the blue, which was meant to be removable, but they also carried a red and/or green for a more permanent thread lock. A few drops on the thread and then the friction of turning the screw or nut helped to solidify the compound.
     
  15. Pio1980

    Pio1980 AK Member Subscriber

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    They didn't use Loctite in electronix as a rule, just the clear green enamel-like dope.
     
  16. 604man

    604man Well-Known Member

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    Glyptal paint or known as "Glyp"

    I used to tune duplexers , and "glyp" was put on the threads after tuning.
     
    Last edited: Oct 14, 2018 at 9:20 AM
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  17. Pio1980

    Pio1980 AK Member Subscriber

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    Amber color in the U.S.
     
  18. squirrelnest

    squirrelnest Addicted Member

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  19. AudioWizard

    AudioWizard AK Subscriber Subscriber

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    When I was a Sony Preferred service station we could purchase the green translucent screw/nut retainer in a small bottle directly from Sony (it had a part #). I think it is lacquered based because dried very quickly and could be removed with MEK.
     
  20. bluesky

    bluesky Addicted Member

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    Shmegma.
     
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