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The hot cathode emits electrons... if the grid is positive (voltage supplied by your ohm meter) current can flow, and the meter indicates some resistance. When you reverse the meter leads the grid will be negative with respect to the cathode and no current flows... open circuit. Usually on ohm meters the red lead is positive.
You have indeed have a diode.
jr
ps: I don't know how the remove shorts function on these checkers works... do you actually measure a short between cath and g1 or g2 and g1 with an ohm meter (cath hot or cold) that is not caused by diode action.
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Last edited by jr_tech; 04-07-2016 at 04:32 PM.
Reason: add ps
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