Ralph Spracklin
CVRS Member

O, I thought you said you have the Schematic. You are also saying it only happens on certain settings. And yes that is how it is supposed to work on the ShortSwitch, because not all the elements in the tube are shorting out. Also on some tubes, Pentodes and other multi-function tubes, some of the elements are connect internally, such as the Cathode can be connected internaly with one or two of the grids. This would possibly register as a short. The same goes for the Cathode and the Filament on some tubes. Nothings straight forward as it sometimes seems it should be. But I think we are making progress.