R/E/P Community
R/E/P => Klaus Heyne's Mic Lab => Topic started by: musicalnyc on February 15, 2018, 11:43:54 PM
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I have a Neumann U48 that was converted to Nuvistor long ago via the AR47 plug-in. I would like to restore it to VF14 specs and I am aware that I need to modify the power supply.
Is there anything within the microphone itself that needs to be adjusted or modified (besides swapping the AR47 with a VF14) in order to reverse it to stock?
Thanks for your help!
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Hello Peter,
The advantage of the AR-47 Nuvistor plug-in: no additional changes inside the mic are necessary to re-convert to VF14 once the plug-in is removed. The mic will be 100% stock again.
The required higher Nuvistor voltage of 110VDC was obtained by replacing one of the four 1KΩ dropping resistors in the original NG power supplies with a wire bridge, and placing that resistor in parallel with an existing one.
Once the wire bridge has been removed and the resistor soldered back in its place again (by a qualified technician, of course!) the NG is also back to stock, ready to power a VF14-equipped U47/48.
When it's done, it will look like this:
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That's great to know. Thanks, Klaus!