10-21-2014, 05:29 PM
You set the red dot to the scale of the "mutual conductance" rating for the tube being tested not the range of the English number listed in the chart. You use English only to test emissions (good/replace scale)
Yes the gm number listed is the minimum acceptable reading but it can test well above that if the tube is new. And just because it tests under doesn't mean the tube is bad, just weak or worn but still may be usable depending on its application.
Yes the gm number listed is the minimum acceptable reading but it can test well above that if the tube is new. And just because it tests under doesn't mean the tube is bad, just weak or worn but still may be usable depending on its application.
