Modifications
- Neumann U47 and U48 (Electronics) |
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"Nuvistor"
type, back to "Original"
VF14 working |
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You
cannot better the sound quality of a U47 / U48, when it is working around
the "Famous" Telefunken VF14 valve. Over the years, service
engineers (including myself) have tried using various other valve types in the U47 / U48,
such as the EF14 and UF14, with varying degrees of success.
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Neumann
designed a modification that allowed the use of the 13CW4
"Nuvistor" type valve in the U47 / U48. Alas, the sound
qualities obtained from a U47 / U48, fitted with a 13CW4
"Nuvistor", are not to every bodies taste. Also, due to the high
running temperature of the 13CW4 when used in the confined / unventilated
space of a U47 / U48, the life expectancy of the "Nuvistor" is
quite short..
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Telefunken
VF14 and 13CW4 "Nuvistor" assembly |
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Through
the use of the new "Missing Link" RV-14m, a replacement valve
for the VF14, we can again appreciate the full virtues of the U47 / U48
microphone.
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See
"Customer
Feedback".
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If
you have an "Standard" Neumann 13CW4
"Nuvistor" modified U47 / U48 kit i.e. including the original
PSU and lead, then it is quite possible to
Retro' Mod' the microphone etc, back to the original
Neumann VF14 design.
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Price, please contact
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Note
- The price quoted, does not allow for any additional work required to
carry out the modification. i.e. Re work due to previous non-standard modifications to
the circuitry etc.
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The
"Missing Link" RV-14m |
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U47 / U48
with "Non-standard" valve
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If
your U47 / U48 uses any other "Non-standard" type of valve, then
it might still be possible to Retro mod' the microphone and PSU back to the
Original Neumann VF14 design.
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Price, please contact
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Note
- The price quoted, covers the cost of "Rebuilding" the electronics of
the microphone and PSU. Together with "Rewiring" the microphone to PSU
cable. Also including the following new parts i.e. valve holder, capacitors and
resistors.
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If
the Capsule / Out-put Matching transformer / Tag Board / Lead (Including some types of
Connectors) are Non-Standard or
Faulty, then additional charges will be incurred.
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U48
during a "Modification'" - Before and After |
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