Unused tube sections

rsumperl · 15th January 2011, 09:35 PM

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

Mr. Triatic · 15th January 2011, 09:57 PM

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.

bob91343 · 15th January 2011, 10:02 PM

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.

DF96 · 16th January 2011, 02:33 PM

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.

15th January 2011, 09:35 PM	#1
rsumperl diyAudio Member Join Date: Oct 2009 Location: Binghamton, NY	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? Thanks Ray

15th January 2011, 09:57 PM	#2
Mr. Triatic diyAudio Member Join Date: Feb 2002 Location: SWE EU	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. __________________ www.joddla.net/audio/

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15th January 2011, 10:02 PM	#3
bob91343 diyAudio Member Join Date: Mar 2010	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.

16th January 2011, 02:33 PM	#4
DF96 diyAudio Member Join Date: May 2007	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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