Mu-metal is effective at reducing induced noise in signal
sensitive gear with high gain and small signal levels.
If you are trying to achieve the quietness of state-of-the-art
hifi, try enclosing transformers with Mu-metal.
One circular layer (overlapping ends) around a transformer
can attenuate by up to 75%.
More wraps = more attenuation.
Best shielding is obtained by enclosing both the source
and the device.
This product conforms to specs ASTM A753 Alloy 4,
MIL-N-14411C Composition 1, and 1J79
Nickel, 4.6% Molybdenum, 14.3% Iron
Saturation Induction BS: 0.74, Coercivity 0.004 A/cm,
50hz max Permeability: 400,000
Mu-metalL is heat treated with "Perfection Annealing"
process in a hydrogen furnace. This process yields the
highest possible magnetic permeability and the best
possible product. The Perfection Annealing process can
improve the permeability up to 40 times.