At your risk.
The role of the grid "leak" resistor should not be to bias (ie change the space charge potential of the grid of the electron tube) but to return the grid to this potential at a certain time constant influenced by said resistor.
Is this what is being done on a Neumann U47? For example by arranging the cathode resistor so that connecting or disconnecting grid resistor would make no change in grid potential therefore no change in anode current?
So there is no grid current (current through this resistor) and possibly much less noise.
More investigation needed.
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