Hi, I'm a lurker here and I thought I'd ask for some help. I have a few boards I saved from the trash that appear to be little HV supplies for a mass spectrometer. I was trying to trace through the circuit and could not figure out what these components were on the (presumably) multiplier part of the circuit. A picture is hereThey look like diodes but don't read as diodes on my multimeter (maybe because they are in circuit). They are marked as 00B or OOB which doesn't seem to be any diode code that I can find.