[Radio Wrangler]

You can probably make a worthwhile improvement and it doesn't take a lot of effort or skill.
Behind each of those controls is a thing called a "potentiometer" google some images and see what typical ones look like. They come in two sorts, rotary ones where as the name suggests you rotate a knob, and slide ones where the 'pot' is a long thin item with a slot in it through which protrudes a lug. A knob clips onto the lug, and you slide it to and fro.

Inside these things is a piece of insulation sheet (often a paper composite) with a thin deposit of carbon on it. This acts as a resistor, across which the circuitry makes a voltage, and a sliding contact scrapes along the carbon track to tap off a variable amount of the voltage.

With age and use these things go dry and the intermittent contact makes scratchy sounds if they are moved or disturbed.

Similarly switches in these things dry out and go scratchy.

A worthwhile improvement can be made by cleaning and re-lubricating them.

The usual way is to spray in a small shot of 'Electrolube' which is made for the job and hangs around to keep the pot/switch working well. DO NOT USE WD40. It doesn't work and it is immense trouble to get rid of the stuff and sort things out.

This usually works, but in severe cases the slider may have scratched all the carbon track off, and the pot will need to be replaced. Do-able, but first the right replacements have to be found and then some soldering is involved.. There are still people who do such repairs, or there is guidance on here for people venturing into DIY.

Oh, and welcome!

David