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Electrical current that flows through a coil
always causes a vibration of the entire
winding (transformer humming). The microphonic
effect (the conversion of mechanical
into electric oscillations) adds these oscillations
back to the original music signal as
additional information. In this way, details of
the original signal are overlaid and rendered
unrecognisable. Firstly, the music loses spatial
quality and transparency and secondly,
distortions and tonal distortions of the signal
are increased. This physical, undesired
microphonic effect is almost completely eliminated
after baking respectively impregnating
the coil.
Baked varnish coils are made from a special
wire. An additional layer of varnish on
the top of this wire is melted shortly by an
electrical power pulse. During the process
of down-cooling the baked varnish welds
the windings together perfectly. They can
therefore almost not vibrate at all any more,
meaning that the original signal, uninfluenced
by the microphonic effect, remains
effective. Regrettably bakable round wires
are available up to 1.40mm diameter and litz
wires up to seven times 0.6mm only (corresponds
to 1.59mm round wire).
Therefore we do offer an alternative procedure
for coils with huge wire diameters that
achieves a comparatively high mechanical
damping - Vacuum impregnation. At that the
coil is first impregnated under vacuum with a
special lacquer as far as the innermost windings.
Subsequently, the impregnated coil
is dried at 130° Celsius and simultaneously
baked into a solid unit.
Both baked varnish coils and vacuum
impregnated coils preserve the musical and
dynamic intricacies of the signal that give
the music its natural liveliness and spatial
quality; For many developers it is justifi ably
an indispensable component of music reproduction
for audiophiles.
For vacuum impregnation there is an additional charge of £9.10 + vat for each coil that requires impregnating.
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