C-47 Stereo Preamplifier
C-47 Stereo Preamplifier
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C-47 Stereo Preamplifier

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C-47 Stereo Preamplifier

The C-47 is the first phono amplifier of this series which realizes a fully balanced configuration from 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 potential of each phono cartridge, the C-47 delivers a rich and deeply satisfying musical experience.

  • 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
  • Balanced output polarity selector
  • Full mono construction
  • Separate toroidal power transformers for left and right channel
  • Low-noise regulated power supply circuitry unaffected by load fluctuations
  • High-accuracy phono equalizer with RIAA deviation of only ±0.3 dB
  • Load impedance settings for six MC and three MM phono 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

 

 

 

RIAA Deviation
MC 10 - 20000 HZ
±0.3 dB
MM 10 - 20000 Hz  
±0.3 dB

Total Harmonic Distortion

(1kHz, at rated output)

0.005%
Gain

GAIN Selector

OFF (Normal)

MC 64dB 
MM 34dB
GAIN selector HIGH
MC  70dB
MM 40dB
 

Input Sensitivity

(1kHz, for rated output)

MC
64 dB 1.26 mV 
70 dB 0.63 mV
 
MM
34 dB 40 mV
40 dB  20 mV

Maximum Input Voltage

(1kHz, 0.005% THD)



MC
64 dB 5.7mV 
70 dB 2.9 mV
MM
34 dB 180mV 
40 dB

90 mV

Maximum Output Level

(0.01% THD, 20-20000 Hz)

BALANCED / LIN OUTPUT  8.0 V
Input Impedance
 MC
10 ohms, 30 ohms, 100ohms, 200ohms, 300ohms, 1kilohm
MM 1kilohm, 47 kilohms, 100kilohms

Rated Output Voltage, 

Output Impedance

BALANCED OUTPUT 2V 50 ohms
LINE OUTPUT  2V 50 ohms
S/N Ratio, Input-converted Noise
Input Input Shorted (A-weighting)
S/N ratio at rated output Input-converted noise 
MC: 64dB
97 dB -155 dBV 
MC: 70dB 
91 dB  -155 dBV

MM: 34dB

 108 dB -136 dBV

MM: 40dB

102 dB  -136dBV
Minimum Load Impedance BALANCED / LINE PUTPUT = 10kilohms 
Crosstalk -90dB or less (10kHZ)


Residual Noise

(A-weighted, with input shorted)

GAIN selector OFF (Normal)  
MC  28.2  or less
MM

7.9 or less

GAIN selector HIGH
MC 56.2 or less 
MM 15.8  or less
Subsonic Filter -12 dB or less (10kHz)
Power Requirements 120 V. 220V, 230V AC (voltage as indicated on rear panel), 50/60Hz
Power consumption 21 W
Maximum Dimensions

Width: 465mm (18.31")

Height: 114mm (4.49")

Depth: 407mm (16.02")

Mass
 Net 14.8kg (32.6 lbs)
In shipping carton 21.0kg (46.3 lbs)

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