I have a few Chinese QS30-1 tubes lying around which don't have much value for me and was wondering how it would look to have all digits lit at the same time. So I looked up the specs which say 170V and 2.25mA So I calculated the needed resistor to have it hooked up to 230V which is a little below 27K I then connected a 27K resistor to one cathode and it lit perfectly fine (230V AC so the anode also glows). So I then connected 10x 27K resistors to all the cathodes and plugged it in. Holy Moly! The thing lit up like crazy and was drawing over 9 Watts and was getting VERY hot. So I turned it off again after a few seconds. Can anyone tell why it's behaving like that?
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