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In Reply to: RE: Grid emission question posted by onemug on July 31, 2016 at 10:44:03
Three possibilities, all giving the same symptoms:
1) Gas can result in current flow, upsetting grid bias
2) Conductive deposits inside (on the mica insulators mostly) or outside.
3) Actual grid emission - the grid is close to the cathode and gets heated - and some cathode material can get transferred onto it. If it emits electrons, it's going positive.
A tube tester can only measure the effect - can't tell you the cause. Some say "Grid Emission", some say "Gas", some just "leakage".
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