Like Mr. Kocourek my N149 does not deliver standard voltages. We own two "M149 tube", with that I could rule out the power suply is damaged because it does not deliver the correct voltages. I can guide you in the repair of this unit.
I'm writing from Chile, across the world and I want to avoid the transfer of the unit to Neumann Berlin.
I am an electronic engineer and manipulate constantly smd components, this ensures that the use of its products will not look altered only with your help.