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Old 7th June 2007, 03:51 AM   #1
jnb is offline jnb  Australia
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Default High bias point.

I am looking at biasing a 6SN7 with 240V from the anode to cathode, -9V on the grid and a little over 6mA of current.

I want to keep this grid voltage (is that reasonable). Would it be more linear if I lowered the anode voltage?
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Old 7th June 2007, 08:58 AM   #2
bigwill is offline bigwill  United Kingdom
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I'm a big tube newbie myself but I think this info can be ascertained by looking at the triode curves
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Old 7th June 2007, 09:06 AM   #3
jnb is offline jnb  Australia
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I'm looking for opinions because some people seem to have their favourite bias points, and things aren't always as they seem. Other than that, I'd think you're right.
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Old 7th June 2007, 09:14 AM   #4
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Hi !
6J5/6SN7/7N7: Stay generally above 9mA. The curves are VERY linear there.
I expecially prefer higher voltages. I have about -6V Ug1 and bit over 200V because of execellent linearty in this region.

Regards, Simon (
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Old 7th June 2007, 03:39 PM   #5
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I agree.... running triodes HOT usually seems best for me!

It's only too much current if the plates start dripping!
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