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Old 15th January 2011, 09:35 PM   #1
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Default Unused tube sections

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?

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Old 15th January 2011, 09:57 PM   #2
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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, 10:02 PM   #3
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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, 02:33 PM   #4
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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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