2L04-6 unstable filament voltage
Filament board was swapped on the 23, but the filament voltage is drooping in and out. This showed up in the KCCU as well when I tried restoring the filament voltage to its previous value of 6.3. Soon after, the zone dropped out of high voltage on filament volts low. Filament board probably doesn't have a good connection to the high voltage crate and needs to be reseated, along with double-checking connections to klystron connection board.










