Seems right, basically green nail enamel.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
I'm also thnking possibly qc inspector checking and sealing satisfactory work.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.
They didn't use Loctite in electronix as a rule, just the clear green enamel-like dope.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.
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.
Amber color in the U.S.Glyptal paint or known as "Glyp"