Problem is, if the light is off and there's nothing on the display - the display is actually on (filament heater is running, 60v PSU is running).

Err, umm, yes, it didn't occur to me...

Dragi "Bonzi" Raos
Zagreb, Croatia
Q#5196, MkII#80000376, 18GB green
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Dragi "Bonzi" Raos Q#5196 MkII #080000376, 18GB green MkIIa #040103247, 60GB blue