Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 575-145109 found under Shield Electron Tube by Dayton Electric Mfg Co. The National Stock Number assigned to this part is 5960008568336, and the Federal Supply Class is 5960 Electron Tubes And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 575-145109.