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Old 10th September 2008, 11:00 PM   #1
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Default triple triode common cathode - only want to use 2 triodes

Hello all,
I would like to use the 6MN8, but only 2 of the triodes (diff amp). What can I do with the other grid/plate to totally keep them out of the equation? Since I'm running fixed bias, maybe I run the raw B- to the 3rd grid and tie the plate to one of the other two, or to the raw regulated driver supply (-85v on the grid should prevent any significant current draw). Any thoughts?
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Old 10th September 2008, 11:16 PM   #2
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Location: Stittsville, Ontario, Canada
You dont really need to do anything to it. You can leave the 3rd grid and the 3rd plate open. No 'extra' current will flow if the plate is open.
Robert McLean
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