Founded in 1951, Penta Laboratories is an ISO 9001:2008 certified manufacturer and distributor of a wide range of electron tubes, especially vacuum tubes. Based in Chatsworth, Calif., the company manufactures and distributes vacuum tubes, capacitors and electron tubes for various broadcast, industrial, research, military, medical and high end audio applications worldwide. The firm specializes in the manufacture of ceramic/metal vacuum tubes, triodes and tetrodes. Its product portfolio includes backward wave oscillators, camera tubes, cathode ray tubes, cold cathode tubes, display devices, pencil tubes, electro-optical devices, flash tubes, gas relays, and many more. In addition, Penta Laboratories maintains a vast inventory of replacement vacuum tubes, even for equipment that dates back 75 years or more.