The mail came right when I finished plowing and the control board got back to me from Joe.... Thanks Joe.
I got the board all back in and powered it up at first all looked well 0V at outputs got the bias set to .355 but the rail voltage dropped from around 76V with just the backplane boards in down to about 57V I don't think that is right to me it should still be up over 70V?
View attachment 33640
If you turn your bias pots all the way down you should see that voltage climb back up Ray. Try it.Yea Joe same DBT I used when I did the backplanes..... to me though the DBT was dim but seemed to look just a tad bit brighter than usual
You are seeing the effect of the bias current and the DBT you have installed in line Ray. That is what I wanted to point out to you by having you adjust the bias voltage down. Even at minimum adjustment, you probably have a bias voltage measurement in the region of 0.2-0.25V present which is dragging down your B+ and B- with the DBT in place.Only goes up to 61V with bias all the way down...