Electron tubes; Vacuum tubes for radios; Rectifier tubes; Vacuum tube replacement devices, namely, solid-state vacuum tube emulators; Capacitors; Amplifiers; Guitar effects processors; Audio cables; Audio speakers; Audio adapter plugs

Electric Light Bulbs and their parts, namely electrodes, glass envelopes, bases, and terminals

SCIENTIFIC AND ELECTRICAL APPARATUS AND DEVICES-NAMELY, CATHODES, CATHODE SUPPORT STRUCTURES AND COMBINATIONS THEREOF