Penta Laboratories was founded in 1951, and quickly achieved industry-wide recognition for the development of the beam-power Pentode vacuum tube. Today, on the dawn of the 21st Century, Penta Laboratories is a world class manufacturer and distributor of a wide range of electron tubes, especially vacuum tubes. Our product line covers broadcast, industrial, research, military, medical and high end audio applications. We have over 8,000 stocking part numbers and an inventory far in excess of a million vacuum tubes. The firm is especially well positioned in the manufacturing of ceramic/metal vacuum tubes, triodes and tetrodes - a Penta specialty. We are also ISO 9001:2008 certified.