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the preamplifier Five analog input pairs are provided for use with balanced (2 pr. XLR)
and single-ended (3 pr. RCA) sources. The inputs are independently
buffered. As with other Mark Levinson preamplifiers, un-selected in-
puts have both their signal and ground connections lifted, eliminating
a possible path where noise may enter the chassis.
The overall gain for the preamplifier section may be adjusted to opti-
mize performance with each input, easily accommodating unusually
high- and low- line level source components within the same system.
This degree of optimization was first offered in the Nº32 Reference
Preamplifier.
All single-ended source signals are converted to balanced at the input
and remain balanced up to the final current gain stage of the amplifier.
In this respect as in so many others, the Nº383 emulates the topology
of Mark Levinson separate components. The result is low noise, highly
dynamic and detailed resolution of the music signal.
the volume control Precision electronic control of analog volume has been a standard fea-
ture of Mark Levinson preamplifiers for nearly a decade. Dual solid-
state stepped attenuators offer precision attenuation of balanced analog
signals. Local supply regulation and passive bypass components are
used to assure optimum results. As with so many of the individual
component parts used in Mark Levinson products, selections were
based on extensive listening tests. As it has always been, carefully con-
trolled listening tests are crucial to the design process at Madrigal.
the power amplifier The Nº383 output stage uses the same devices (12 per channel) as the
Mark Levinson 300-series and Nº33H amplifiers. All output devices are
sorted by Madrigal technicians, allowing us to construct each channel
using transistors of closely matched gain. In this way, we ensure that no
one device works harder or runs hotter than any of its neighbors. The
result is a better sounding, longer lasting amplifier.
The large output capability of this amplifier required that proper cool-
ing be a consideration in the design. Output transistors are widely
spaced along the current gain circuit board in order to facilitate heat
dissipation. Ventilation is provided by custom heatsink extrusions
mounted on the sides of the chassis.
protection Protection from internal or external component failure is an integral
feature of the Mark Levinson design philosophy. The Nº383 employs
several forms of protection, both for its own self-preservation as well as
the protection of loudspeakers and other components to which it is