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triple triode common cathode - only want to use 2 triodes

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audiowize

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Joined 2005
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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