6GM8/ECC86

albertli · 21st February 2011, 01:09 AM

Guys,

Do I have to ground pin 9 for better channel separation if I use AC for heater.
Thanks

Albert

yajnaS · 21st February 2011, 07:03 AM

Pin 9 is the shield, you need to ground it. Irrespective of the heater.

mastodon · 21st February 2011, 08:12 AM

I'd say so, yes. But I don't see the connection with using an AC heater. What's the story behind that?

DF96 · 21st February 2011, 10:12 AM

If pin 9 is the shield, then it probably has nothing to do with the heater. If a shield is present, then it should either be grounded or attached to a cathode - basically you want it grounded for AC, and negative for DC. The former ensures that it does act as a shield and reduces capacitive coupling between valve sections; the latter ensures that it does not pick up stray electrons.

albertli · 21st February 2011, 02:12 PM

Thanks guys,

I'd put pin 9 to ground as of advices.

Albert

21st February 2011, 01:09 AM	#1
albertli diyAudio Member Join Date: Nov 2004 Location: Vancouver	6GM8/ECC86 Guys, Do I have to ground pin 9 for better channel separation if I use AC for heater. Thanks Albert

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21st February 2011, 07:03 AM	#2
yajnaS diyAudio Member Join Date: Jan 2011	Pin 9 is the shield, you need to ground it. Irrespective of the heater.

21st February 2011, 08:12 AM	#3
mastodon diyAudio Member Join Date: Jan 2011	I'd say so, yes. But I don't see the connection with using an AC heater. What's the story behind that?

21st February 2011, 10:12 AM	#4
DF96 diyAudio Member Join Date: May 2007	If pin 9 is the shield, then it probably has nothing to do with the heater. If a shield is present, then it should either be grounded or attached to a cathode - basically you want it grounded for AC, and negative for DC. The former ensures that it does act as a shield and reduces capacitive coupling between valve sections; the latter ensures that it does not pick up stray electrons.

21st February 2011, 02:12 PM	#5
albertli diyAudio Member Join Date: Nov 2004 Location: Vancouver	Thanks guys, I'd put pin 9 to ground as of advices. Albert

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