[GeoffK]

This is an AC only radio so will not have a live chassis, it would be an idea to get Trader Sheet 817 and read it thoroughly to get an understanding of how the radio works. It has an unusual negative feedback volume control arrangement. The yellow wax capacitors you refer to are in the tuning or RF section and should be left alone, they are unlikely to be faulty, the small capacitors inside the IF cans should also be left alone, unless there is a specific reason to suspect a faulty RF or IF capacitor they should not be touched. Even the black capacitors can be quite reliable in the lower voltage stages. capacitor C21 the output valve control grid coupling capacitor may need replacing, and the main smoothing capacitors C26 C27 need to be reformed or replaced. The radio should ideally be connected to a variac to bring the voltage up slowly.