6AS7G Grid Voltage ?? - diyAudio
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Old 23rd May 2008, 05:36 PM   #1
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Default 6AS7G Grid Voltage ??

If i have a 6AS7G with 150V plate voltage, how do i determine how many -V are required at the grid to fully turn it off?
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Old 23rd May 2008, 06:05 PM   #2
GordonW is offline GordonW  United States
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You just need to look at the plate curves. Here's a datasheet, with the plate curves, for the 6AS7GA (which is equivalent to what you have):


Looking at that curve... you just go across the bottom of the graph, to the plate voltage you want, and see which one of the grid bias curves is closest... this will give you the grid voltage.

For 150V B+, looks like it needs between 100 and 110v negative, to completely drive it down to cutoff...

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Old 23rd May 2008, 08:04 PM   #3
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Thank you! I just wanted a double check to see if what i thought i was learning and figuring out was in fact correct!

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