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Re: Schematic for the NKMa psu + KM56 microphone
Author: Klaus Heyne
Date: 08/07/2017
A Google search for "AC 71 tube" came up empty.
You would need to go to your source who told you that there is a suitable replacement for an AC701 and get solid information to support that claim. I know of no AC701 substitution.

But maybe you meant to write 'AC761', a failure-prone East German RWN Neuhaus copy with bad noise specs? Beware of false claims on eBay in this regard.  
 
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