Marshall Valavestate V40 8040

[notabot]

Hi, I'm working on a friend's Marshall Valvestate 8040, it is stock, clean, no fiddling, no dust, just scratchy pots. Power supply is steady, no DC on the pots, no leaking coupling caps. Reflowed the solder on pots.

Using quite a bit of contact cleaner. Amp works a lot better now after cleaning the pots, BUT, wondering if these are the "economic" pots that have cardboard backing and will need to be replaced if they go intermitant over a few days?

The amp is over 30yrs old I told my friend it would be a good idea to replace the electrolitycs. Making a PL for him, he said if the cost goes too high he'll sell or scrap  it.

Schematic: https://www.drtube.com/schematics/marshall/8040-iss8.pdf

[g1]

Not sure what you mean about the cardboard, I've never heard of that.
Generally with pots, if cleaner doesn't work you replace them.  But sometimes if you actually take the pot apart you can do a much better job of cleaning them, it's just quite time consuming.
Also, there are electrical 'contact cleaners' that are not suitable for controls like these, as they leave no residue or lubricant.

If the amp has no other issues, there is no pressing need to do a re-cap if he does not want to spend the money on it.