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Old 15th January 2011, 10:35 PM   #1
rsumperl is offline rsumperl  United States
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Unused tube sections
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Greetings everyone,
So if I have a multi section tube and I am using only one section of that multi section tube, should the unused elements be grounded or left floating?

Thanks
Ray
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Old 15th January 2011, 10:57 PM   #2
Mr. Triatic is offline Mr. Triatic  Sweden
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i would ground the grid and the plateconnection thrue a resistor although high voltage "next door" can cause problems and should be taken into consideration.
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Old 15th January 2011, 11:02 PM   #3
bob91343 is offline bob91343  United States
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I don't think it really matters. If you ever plan to use the unused sections, you should occasionally draw some plate current to avoid cathode interface problems. If not, forget about it.
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Old 16th January 2011, 03:33 PM   #4
DF96 is online now DF96  England
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Sometimes 'floating' electrodes in the same envelope can acquire voltages and disturb the operation of the active section. I would ground the unused parts, or connect them to the cathode of the active section, whichever is more convenient. This assumes that you don't intend to ever use the spare section.
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