Guys,
Do I have to ground pin 9 for better channel separation if I use AC for heater.
Thanks
Albert
Do I have to ground pin 9 for better channel separation if I use AC for heater.
Thanks
Albert
I'd say so, yes. But I don't see the connection with using an AC heater. What's the story behind that?
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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