Thank you for your Selection of the 5M21/5M20
The 5M21/5M20 is a stereo
power amplifier which constitutes
the core of LUX's prestigious Hi-Fi
components named "Laboratory
Reference Series". The output is
1 00W per channel into 8 ohms load
according to the FTC rules, and this
is comprised in the category of high
powered amplifiers. Functionwise
this is provided with 2 large VU
meters to monitor an output power
on both right and left channels,
meter sensitivity, and DC offset
senser to check DC components
at the input.
As explained by the words
"REALTIME PROCESSED", with
the 5M21/5M20 we delved not only
into spatial wave form but alSù into
time problem (phase) so as to ensure
the most faithful amplification of
the music signals-passing and un
repeatable wave-form signais. Es
pecially to remove the phase
distortion at the bass range a DC
configuration was adopted, and also
as regards the harmful notch
distortion at the treble rangè,
exhaustive study rendered on the
components as well as the circuitry
made it possible to reduce it
lower than even that of class A amp
without sacrifice of output power.
The advantage of DC amp has
been fully appreciated, but such
configuration has never been taken
up by the major manufacturers
because of its inherent drawback of
DC drift triggered by fluctuation of
temperature and other ambient con
ditions.
However this barrier is
successfully removed, and a DC amp
of unconditional stability is realized
thanks to the• newly developped
FET's differential circuit and its
auxiliary circuit of DML-IC.
1 n addition, to ensure stable
po·wer supply to all the circuits
involved, we combined 2 inde
pendent large toroïdal power trans
formers for right and left channels
with electrolytic capacitors of huge
capacitance and low impedance.
Such components as resistors, semi
variable resistors and capacitors are
carefully selected.
We recommend you to choose
with care other Hi-Fi components
for the optimum operation in com
bination with this unit, and go
through the contents of this owner's
manual to make the most of the
potentiality of this power amplifier.
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