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Old 21st February 2011, 01:09 AM   #1
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Default 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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Old 21st February 2011, 07:03 AM   #2
yajnaS is offline yajnaS  India
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Pin 9 is the shield, you need to ground it. Irrespective of the heater.
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Old 21st February 2011, 08:12 AM   #3
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I'd say so, yes. But I don't see the connection with using an AC heater. What's the story behind that?
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Old 21st February 2011, 10:12 AM   #4
DF96 is offline DF96  England
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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.
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Old 21st February 2011, 02:12 PM   #5
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Thanks guys,

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

Albert
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