So of course, I kept going but it was not until I I reached 384.5VAC when the lamp lit up to full brightness and started drawing 52mA. Another USA vendor that has most of these products and links to the MSDS is parts-express.com - search for deoxit. It is not for sliding or moving surfaces such as metal on metal or metal on plastic as found in potentiometers / faders. Which is why I was experiencing the problems. When probing the faders with the ohm meter they measure the corerect value when moving all the way along using either spray. I repeated this test with my 'big' power supply and I started getting around 35µA of current at about 495VDC.

I did think about opening the pots up but they appear to be melted plastic pegs through a hole in the metal casing so I can't simply bend up any tabs like most pots. Has anybody got a can of Deoxit F5 that can send me a pic of the ingredients on the can please see what it actually is? The only difference I found is that the Deoxit is ever so slightly conductive. I sprayed a small amount of each into two bottle caps and then used my ohm meter to measure the resistance.In the short term as I stated previously the super 40 seems to be a perfect lubricant for these purposes. Unlike Marshall who have the luxury of, in Jim Marshall's words using "off-the-shelf components" which are easily available. A sensible move in their business model in my opinion as I have yet to find a Marshall amplifer that Marshall cannot supply parts for no matter how old it is.

So in my opinion, the Deoxit should only be used up until around 50VAC. Which I guess is fine for audio circuitry, which is exactly what they advertise it is designed for. I repeated the test with the Servisol Super 40 and got approximately 41µA of current at about 452VDC. So I conclude that they are both pretty darn good with DC and about the same performance as eachother.H319 Causes serious eye irritation.H315 Causes skin irritation.H336 May cause drowsiness or dizziness.H411 Toxic to aquatic life with long lasting effects.H222 Extremely flammable aerosol.H304 May be fatal if swallowed and enters airways.H229 Pressurised container: may burst if heated. It is your responsibility to request a return. If you don’t tell us you want to make a return, we don’t know. Once you do tell us, we will do everything we can to action it.