English: The 7586 Nuvistor type, manufactured by Philips in USA. RCA introduced the Nuvistor in 1959 as a miniature, rugged, metal-ceramic enclosed vacuum tubes, as a serious competition for the transistor. The 'Nuvistor' name evoke similarities to the words 'new' and 'transistor'. The 7586 is a medium mu triode. The Nuvistor was the final evolution of the thermionic valve as a general purpose active circuit element.
Manufactured by Philips
The 7586 Nuvistor type, the cylindrical electrodes very well and the supporting structure of the pins projecting directly through the ceramic base wafer.