On Sunday 10 November 2013 09:20:49 pm Tom Taggart wrote: > Would be nice if there was an easy way to kill the plate voltage to the final. I would not ! Could be the screen is derived from the plate, and give you false indications. Kill the filaments to protect the tubes. Knowing that high voltage *is* present, treat it like it will kill you, because it will !! -- Cowboy