STEREO PHONO AMPLIFIER● Low-noise fully balanced configuration ● One dedicated balanced MC phono
input and three sets of regular phono inputs ● Separate settings memory for each
input position ● Balanced and line level output connectors ● Polarity selector forbalanced output ● Full mono construction ● Low-noise regulated power supply
circuitry unaffected by load fluctuations ● High-accuracy phono equalizer withRIAA deviation of only ±0.3 dB ● Load impedance settings for six MC and threeMM phono cartridge types ● 7-segment LED indicator shows load impedance● Gain selector for low-output phono cartridges ● Built-in subsonic filter

The Realization of a Dream — Fully Balanced Phono Equalizer Amp
The C-47 is the first phono amplifier of this series which realizes a fully balanced configurationfrom input to output. The resulting product not only is highly impervious to external noise,it also features a dedicated head amplifier optimized for the characteristics of MC and MM
phono cartridges, and a high-accuracy equalizer amplifier, thereby ensuring precise equalization
with a minimum of noise. A set of newly added dedicated balanced MC phono inputs enables
balanced connection to the analog record player. By bringing out the full performance potentialof each phono cartridge, the C-47 delivers a rich and deeply satisfying musical experience.

Innovation ‒ At the leading edge of technology■ Extremely low noise and highly accurate equalizer characteristics
The C-47 features a two-stage design with a low-noise head amplifier
optimized to handle MC and MM cartridges and a high-accuracy
equalizer amplifier dedicated to the task of equalizing the signal. By
designing the low-noise head amp for high gain (MC: 50 dB, MM: 20dB), the influence of any noise components in the subsequent equalizer
amplifier is kept to a minimum, resulting in excellent low-noise
performance combined with super-accurate equalization characteristics.
■ Fully balanced configuration
As a first in the series, the C-47 employs a fully balanced configuration
which reliably shuts out external noise. The output signal from thecartridge is treated as a balanced signal, and the head amp performs
balanced amplification (amplifying only the difference between two
signal inputs). Balanced signal transmission is maintained also after thehead amplifier, and full equalization is realized by making the equalizer
amplifier a balanced type as well.

■ Fully balanced configuration with MC / MM head amp and equalizer amp
Balanced amplification
MC / MM
head amp

Balanced
input

Balanced amplification
Equalizer
amp

Balanced signaltransmission

Balancedoutput■ Disc equalizer assembly■ Full mono construction
For enhanced channel separation, it is crucial to keep the circuitry ofone channel physically separate from the other. In the C-47, the head
amp and equalizer amp are mounted on separate boards for the left
and right channel, but the designers have gone one step further. The
toroidal transformer, smoothing aluminum electrolytic capacitors, andregulated power supply circuitry are also duplicated for each channel,
thereby realizing a fully monaural configuration.

• Board contains MC / MM head amp

and equalizer amp• Separate boards for left and right channel(Top: left Bottom: right)• Glass cloth fluorocarbon resin PCBsSound quality ‒ Simply aiming for the best
■ Low-noise regulated power supply circuitry unaffected by load fluctuations
In a phono equalizer amplifier that handles extremely weak signals,
the quality of the power supply has a significant effect on soundquality. The smoothing circuitry employs four 25 V / 15,000 μF aluminumelectrolytic capacitors per channel, specially selected for their sonicproperties. This generously dimensioned configuration virtually eliminates
adverse effects from ripple currents and similar. The use of a regulated
power supply circuit with very low noise voltage and excellent handlingof load fluctuations further ensures that the power supply does not
introduce any noise.

■ Power supply assembly■ Dedicated balanced MC phono input
A dedicated balanced MC phono input makes it possible to handle
the signal supplied by the cartridge as a balanced signal. A balanced
phono cable can therefore be used for the connection between theanalog record player and the C-47.

■ Dedicated balanced
MC phono input• Regulated power supply circuitry

unaffected by load fluctuations• Separate circuits for left

and right channel

Head amplifier section

Equalizer amplifier section

BAL MC
21SUBSONICFILTER
AMP.

＋3＋

MC
HEAD AMP.
(50dB)

INPUT &MC/MM

GND

RIAA
EQUALIZER
NETWORK−INPUTSLOAD
IMPEDANCE

GND

MC/MM

FILTERGAIN

EQUALIZER
AMP.
(14/ 20dB)＋2

BALANCED
2BALANCEDCONNECTION

31＋GND
3OUTPUTS

−

1GND

LINE

−

INPUT

RIAA
EQUALIZER
NETWORKMM
HEAD AMP.
(20dB)−SUBSONICFILTERAMP.

■ Block diagram (one channel)

Advanced features■ Low-noise fully balanced configuration■ One dedicated balanced MC phono input and threesets of regular phono inputs■ Separate settings memory for each input position■ Balanced and line level output connectors■ Balanced output polarity selector■ Full mono construction■ Separate toroidal power transformers for left andright channel■ Low-noise regulated power supply circuitry
unaffected by load fluctuations■ High-accuracy phono equalizer with RIAA deviationof only ±0.3 dB■ Load impedance settings for six MC and three MMphono cartridge types■ 7-segment LED indicator shows load impedance■ Gain selector for low-output phono cartridges■ Built-in subsonic filter■ Disc equalizer assembly using glass cloth
fluorocarbon resin PCBs with low dielectric
constant and low losses■ Gold-plated printed circuit boards■ Aluminum top plate with hairline finish■ Elegant side panels with natural wood grain finish■ Supplied with premium quality "ASL-10" audio
cables for best soundAluminum top plate withhairline finish

Elegant side panels withnatural wood grain finish

MC / MM selector

GAIN selector

Subsonicfilter buttonLoad impedance
selector and7-segment LED indicator

Input selector withadded position for
dedicated balanced
MC phono input

High-capacitance 25 V / 15,000 μF
aluminum electrolytic capacitors
for current smoothing

Internal layout realizes full mono construction toprevent mutual interference between channels

High-efficiency toroidal powertransformer

Performance Graphs
THD vs.
Input Voltage
Model:
Serial:Date:
Input:
Output:Comment:

100.1

640.01

Ground lead

2064 dB

Maximum Input Voltage
20Hz:0.68mV
1kHz:
6.30mV
20kHz: 59.90mV

Analog record player

8C-47

Load Impedance:
Gain at 1kHz

Connection Example
Analog record player

Balancedphono cable-20.001

Ground lead

Phono cable

Phonocable

Ground lead

-4

Phono cable-6

Ground lead

-80.0001
10μV

100μV

1mV

10mV

-10
10100mV

100

1k

10k

100k

C-47

Input voltage vs. THD characteristics (MC input)
THD vs.
Input Voltage
Model:
Serial:Date:
Input:
Output:Comment:

RIAA deviation (MC input)
100.1

8C-47

640.01

2

Load Impedance:
Gain at 1kHz

034 dB

Maximum Input Voltage
20Hz:
0.02V
1kHz:0.20V
20kHz: 1.58V-20.001-4Line-levelcable-6-80.0001
100μV

1mV10mV100mV

1V-101010V

100Input voltage vs. THD characteristics (MM input)

GAIN
Subsonicselector ﬁlter button

MCMM7RWDO+DUPRQLF'LVWRUWLRQN+]DWUDWHGRXWSXW
Gain*$,1VHOHFWRU+,*+MC,QSXW6HQVLWLYLW\N+]IRUUDWHGRXWSXWMMMC0D[LPXP,QSXW9ROWDJH N+]
7+'

MM

Preamplifier or
integrated amplifier

AC power supply connector★

Load impedance
selector௅+]௅+][Guaranteed specifications are measured according to EIA standard RS-490.]±0.3 dB±0.3 dB

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Line input Balanced input

100k

Balanced MC phono Phono input Line output Balanced output Balanced output
input connectors
connectors connectors
connectors
phase selector

Input selector

Guaranteed Specifications
RIAA Deviation

Balancedcable

Rear Panel

Function display

MC / MMselector

10k

RIAA deviation (MM input)

Front Panel

Power switch

1k

Select oneof theseconnection
methods

MCMMMCMM64 dB
70 dB
34 dB
40 dB
64 dB
70 dB
34 dB40 dB

64 dB
34 dB
70 dB
40 dB
P9P9P9P9P9P9P9P90D[LPXP2XWSXW/HYHO 7+'௅+]BALANCED/LINE OUTPUT

9,QSXW,PSHGDQFHMCMMRKPV, RKPV, RKPV, RKPV, RKPV, NLORKPNLORKPNLORKPVNLORKPV

5DWHG2XWSXW9ROWDJH BALANCED OUTPUT
2XWSXW,PSHGDQFH
LINE OUTPUT

9RKPV
9RKPV,QSXWVKRUWHG $ZHLJKWLQJ,QSXW
61UDWLRDWUDWHGRXWSXW ,QSXWFRQYHUWHGQRLVH
615DWLR
MC: 64 dB
G%
íG%9,QSXWFRQYHUWHG
MC: 70 dB
G%
íG%91RLVH
MM: 34 dB
108 dBíG%9
MM: 40 dB
G%
íG%90LQLPXP/RDG,PSHGDQFH BALANCED/LINE OUTPUT
NLORKPV&URVVWDONíG%RUOHVV N+]
MCȝ9RUOHVV*$,1VHOHFWRU2))
5HVLGXDO1RLVH
1RUPDOMM
ȝ9RUOHVV$ZHLJKWHGZLWKMCȝ9RUOHVVLQSXWVKRUWHG*$,1VHOHFWRU+,*+MMȝ9RUOHVV
6XEVRQLF)LOWHUíG%RFWDYH, +]3RZHU5HTXLUHPHQWV 999$& YROWDJHDVLQGLFDWHGRQUHDUSDQHO +]3RZHU&RQVXPSWLRQ:
0D[LPXP'LPHQVLRQV :LGWKPP ´ [+HLJKWPP ´ ['HSWKPP ´NetNJ OEV 0DVV,QVKLSSLQJFDUWRQNJ OEVRemarks★ This product is available in versions for 120/220/230 V AC. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.
★ The 230 V version has an Eco Mode that switches power off after 120 minutes of inactivity.
★ The shape of the plug of the supplied AC power cord depends on the voltage rating and destination country.

Supplied accessories● AC power cord
● Audio cables ASL-10● Cleaning cloth●The specifications and appearance of this product are subject to change without notice.
D202.5Y PRINTED IN JAPAN 850-2218-00（B1）