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Precision Signal Ground Circuit,
to preserve signal purity
In the PMA-SA1, the adverse effects of noise
from the constant current circuit and other sources
onto the signal as it passes through the power
amplifier stage are minimised by the careful place-
ment of ground points for each circuit. The signal is
thus amplified under ideal conditions to produce an
eminently clean, transparent sound.
Fully independent phono
equaliser amplifiers
The phono equaliser circuit, equipped with its
own dedicated stable power supply, uses a
low-noise FET at the first stage, allowing the
listener to enjoy recorded performances with
superior sound quality and characteristics. Since
the power supply is independent, the phono
equaliser alone can be turned on and off. If the
equaliser is not being used in CD playback or other
situations, turning it off prevents adverse effects
on line input.
"Simple & Straight" circuit design
To ensure that music playback is pure and free
of coloration, every effort has been made to keep
the signal path simple and straight. The PMA-SA1
does not come with PRE OUT / MAIN IN or head-
phone terminals, or with tone, loudness, and
muting controls.
Chassis construction with 6
independent blocks
The PMA-SA1's chassis has been divided into
six independent blocks for the equaliser/input
section, volume control section, voltage amplifica-
tion section, power amplification section, power
supply section, and the control section. The 1.6mm
thick copper-plated steel plates used to construct
the chassis protect the signal circuitry from external
vibration and also eliminate adverse influences
between the circuits.
Independent L/R Heat Sinks
The PMA-SA1's heat sinks are equipped with
stabilisers that sufficiently suppress resonance, and
L/R separation is clearly improved by having inde-
pendent heat sinks for the left and right channels.
Generous use of large gold-plated
speaker terminals and other parts
selected for high sound quality
DENON has endowed the PMA-SA1 with a
wealth of parts carefully selected for superior
sound quality. These include machined gold-plated
pin jacks, OFC for internal wiring, resistors, capac-
itors, cast insulators, and large gold-plated
speaker terminals.
European Sound Tune
In the selection of parts for the PMA-SA1, pri-
mary emphasis was placed on the texture and
atmosphere created by the sound, since most
Europeans come into contact with live perfor-
mances in all genres of music on a daily basis and
naturally expect this quality of sound from their
08
sound system at home. Amplifiers that handle deli-
cate, low-level input signals are particularly subject
to both internal and external vibrations that adverse-
ly affect the sound's transparency over the entire
audible spectrum. To avoid these difficulties,
DENON has devised their own unique method of
combining a variety of vibration-resistant materials
that ensure an ideal level of silence within the
PMA-SA1. Together with its UHC-MOS single
push-pull circuitry and robust power supply, the
PMA-SA1 reproduces a remarkable musical bal-
ance, from the finest pianissimos to the most pow-
erful fortissimos.
Improvements in Parts for High
Sound Quality
The PMA-SA1 uses parts, such as film capaci-
tors, electrolytic capacitors, resistors, and induc-
tors,
that have been dramatically improved for
sound quality over the past ten years since DENON
released the PMA-S1. Each part has been carefully
selected through stringent tests to ensure they per-
form at uniform standards and are appropriate for
reproducing the original sound. In addition, OFC
wire has been used for the power supply connector
cable and the lead wires from the transformer. The
overall aim of these parts is to produce a more nat-
ural and realistic sound.
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