Eico 625 tests read 90/88. This ruggedized Raytheon tube is from 1967 USA military production. It features ribbed black plates, a halo getter and a third mica layer for enhanced quieting. 1 NOS Raytheon JAN 6829Vacuum Tube.
Eico 625 tests read 90/88. This ruggedized Raytheon tube is from 1967 USA military production. It features ribbed black plates, a halo getter and a third mica layer for enhanced quieting. 1 NOS Raytheon JAN 6829Vacuum Tube.