Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M2403LB found under Electron Tube by Teledyne Wireless Llc. The National Stock Number assigned to this part is 5960009729597, 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 M2403LB.