John Robertson wrote:

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However I did find that an Army/Navy/Air Force repair manual for
oscilloscope 0S-261/U (NSN 6625-00-127-0079)(Techtronics 475) says:

"There are three recommended switch lubricants. They are Silicone
Versilube (General Electric Co.), Rykon R (Standard Oil),
and WD-40 (Rocket Chemical Co.)."

Which I find surprising based on my experience (seized up shafts),
however note that this is a SWITCH lubricant, not a potentiometer. In
the manual they specifically state that you don't lubricate sealed pots.



** It is not possible to "lubricate" a sealed pot, you need to make a small hole in it first. Sealing a pot does not prevent it becoming noisy.

The vast majority of pots have an opening that allows fluid to enter and a short squirt of WD-40 does the job in seconds. Of course you DO have to rotate the pot a few times as well.



..... Phil




So, I will revise my comments accordingly, it would appear that WD-40 is
OK for switch contacts - at least in the mid-70s. Use sparingly!

Anyone here know anyone at Techtronics who can confirm if they still
ahve it on the list of recommended lubricants for switches?

Live and learn, eh?

John