What should you do for safety, before removing the shielding on a UHF power amplifier?

UHF power amplifiers can generate highly dangerous levels of RF energy and often contain lethal high-voltage DC power supplies. Before removing any protective shielding, you must ensure the amplifier cannot be accidentally energized to protect yourself from severe burns, electrical shocks, or hazardous RF exposure. While grounding the output or using filters might sound like good engineering practices for signal management, they will not protect you if the amplifier is accidentally powered up while the shielding is off. Complete de-energization is the only safe approach.