National/Greenstone 4CX15000A

National/Greenstone 4CX15000A 4CX15000A / 8281 is a tube intended for use in audio or radio frequency applications. It features a new type of internal mechanical structure that results in high RF operating efficiency. Low RF losses in this mechanical structure authorize operation of the 4CX15000A / 8281 at full ratings up to 110 MHz and at reduced ratings to 225 MHz.