Several companies are currently offering a rewind service for German
Tube Microphone Transformers. Some do a very nice rewind but most
services opt
for a computer controlled simulation of the original
vertical
sectioning. The reason for the simulated technique over the
original approach is simple economics. There is not enough market to
justify tooling up to mold the compartmentalized bobbins that were
originally used. While the CNC winding method with non-original style
bobbins may return similar sonic results, often the look is not very original.
Vintage Windings bobbins are hand casted from molds made from perfect
originals. The molds were made from out-gassed and vacuum cast high
quality silicon molding material. The bobbins are cast from out-gassed
high temp casting resin formulated for it's hi dielectric and heat
resistant qualities. The
bobbins will exceed the lifespan of the originals significantly. The
rest of the rewind is carried out following the same techniques that
were used originally. The final rewind looks correct and performs to
original specifications. The turn around time on the rewinds is
generally about two weeks, however, the bobbins are prepared in small
lots which may affect lead times.
Please
e-mail for details. Note: A complete dissection
of the BV style Neumann transformers appears on this
DVD.
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