It depends on whether you talking physically big or large capacitance. All amps have filter caps to reduce the ac ripple when converted to DC. But tubes require very high voltages to operate. SS amps typically don't require these larger voltages and therefore are RELATIVELY SAFER. That's not to say they are safe to poke around inside.

Another thing to consider before poking around inside ANY amp if you don't know what you're doing, is the costly damage you can do. On some solid state amps (SS) you can fry parts that aren't even available anymore, rendering the amp useless.

My advice to anyone who is having amp problems and doesn't know what's going on inside..........Take it to someone who does know.