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. 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. Now the Servisol Super 40 was similar at low voltages but performed better further up. I got exactly the same 25µA at 56VAC, but when I went to 103VAC I was still only drawing 0.96mA. This was a lot better that F5's 80mA!

I will do half the channels on this mixing desk with Servisol super 40 and the other half with Deoxit F5 and see what the difference 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. What lubricant is used in the factory? When the potentiometers are new they have a 'stiffness' to them if that makes sense?

I have done a lot of research and narrowed it down to three types of lubricant which are available under many different brand names: It is hard to predict if a given product will solve a given problem on a given fader. It might ruin it, too. Most products will at least temporarily clear up a "dirty" pot problem, but long-term may be another matter. Pot replacement may be the best choice. My experience with Deoxit generally is that they are good, but can't permanently cure a worn pot.

\n\t\t\tHalfords Electrical Contact Cleaner 500ml

I repeated this test with my 'big' power supply and I started getting around 35µA of current at about 495VDC.

I sprayed some deoxit F5 into a bottle cap and connected it to my power supply using two crocodile-clips on the edges of the bottle cap with the metal tips submerged in the liquid, and my ammeter in series to measure any current flow. I also had a 20W lamp in series to protect the power supply.

So again, I kept increasing and I eventually got to 400VAC and could not get the deoxit to boil. This is as high as the power supply will go. Another USA vendor that has most of these products and links to the MSDS is parts-express.com - search for deoxit.

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.Using a DC voltage, I turned it up all the way to 100V and there was no significant conductivity (less than 20µA which is as low as my ammeter measures).