These metal vacuum tube shields provide RF/EMI shielding and mechanical retention for receiving and power tubes in vintage radios, communications receivers, and audio amplifiers. Constructed from aluminum or tin-plated steel, each shield fits over chassis-mounted tube sockets and includes internal grounding or tension springs to hold the tube securely. Manufactured historically by companies such as Cinch-Jones, IERC (International Electronic Research Corp), and Elco, these shields prevent inter-stage interference, reduce hum, and dissipate heat during operation.