Quote:
Originally Posted by Kevin Kuehn
Well now that I looked it does appear both Sams and Riders voltage references are from chassis ground. I do think the b- dropper string is easier to understand looking at the Sams schematic. B+ center tap is connected through the focus coil and 3 series resistors to ground. Because all b+ current passes through those components it creates a negative voltage across it's path to ground. The closer you get to ground, the less negative the voltage becomes. Hope that makes sense?
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right now, all voltages are wrong, which is not surprising, since my tube sockets and pins are very dirty, i need to clean, many would not even light up heaters w/o removing and replacing.
the point that shows 300v on the Riders is at 378v with the variac at 70% and the point that says -100v shows -30v.
the big resistor in the voltage bleeder is getting very warm, burned my finger.
I'm gonna see what happens after i clean the tubes, I'm hoping that after they are clean and the load is more stable, the voltage will be more stable, otherwise, i will have to track down why it is not normal :/