STATUS - SOLD
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Description :
The Accuphase C-230 is a high gain control preamplifier which symbolizes the combined aggregation of Accuphase audio technology. It employs the basic Accuphase design of complementary-symmetry push-pull driven circuitry, features Class-A operated DC amplification and utilizes a newly innovated DC Servo Control system in its high level amplifier. By using a push-pull drive in every stage of circuitry, it has the low distortion and high stability. The DC amplifier system eliminates sound coloration and assures high quality sound reproduction. MOSFETs are utilized in a control center with no notching distortion. The unit amplifiers are equipped with exclusive voltage power supplies to alleviate the inefficiency of high frequency range in wideband amplifiers. The DC Servo Control System allows the system to operate as a DC amplifier without blocking capacitors which cause sound coloration and prevents shock noise. The Accuphase C-230 has a thoroughly designed equalizer, using Class-A operated MOSFETs to achieve large current drive and low output impedance to obtain highest signal to noise ratio. It also has a feedback canceller circuit to prevent sound quality to deteriorate from the capacitive feedback. The push-pull head amplifier is connected to moving-coil cartridges to realize a clearer, richer and more detailed sound reproduction character.
The Accuphase C-230's tone control function is expanded to provide a smooth control over a selection of turnover frequencies for bass and treble. It has a rotary switch that allows tonal variation and on/off switching of tone control circuit. The preamplifier has three-step loudness compensator to provide a choice of sound energy balancing curves to help human ears detect certain audio frequencies during low-level reproduction, as well as balancing out listening room characteristics. The subsonic filter cuts off frequencies below 17Hz that sometimes cause intermodulation distortion in the audible frequency range. The C-230 allows two tape recorders to be connected. There is an independent copy switch that permits copying while enjoying a different program source. The output can be cut off by the switch at any occasion. The Accuphase C-230 is a remarkable preamplifier engineered by Accuphase after extensive tests with the best inherent characteristics. With the extravagant circuitry and effective components, it elevates the preamplifier to be among the best. Accuphase is confident that they have perfected a control center of the highest order in the C-230 with which the inner world of musical reproduction can be enjoyed to the full extent.
Specifications :
Frequency Response...........................+0, -0.2dB, 20Hz - 20kHz (High level input)
.............................±0.2dB, 20Hz-20kHz (Low level input)
Distortion.............................................Better than 0.005% at rated output level throughout all stages,
.............................................20H -20kHz
Input Sensitivity....................................0.125mV (Rated output) / 0.05mV (0.5V output)
....................................(Disc, HEAD AMP: ON)
.....................................2.5mV (Rated output) / 0.96mV (0.5V output) (Disc, HEAD AMP: OFF)
.....................................160mV (Rated output) / 62mV (0.5V output) (Aux, Tuner Tape Play)
Input Impedance...................................100ohm (Disc, HEAD AMP: ON)
...................................100, 47k, 82k, 150kohm (Disc, HEAD AMP: OFF)
..................................47kohm (Aux, Tuner Tape Play)
Maximum Input For Disc Input...............300mV RMS for 1,000Hz, with 0.005% Distortion (THD+N)
................(Disc1&2 - Without HEAD AMP)
................15mV RMS for 1,000Hz, with 0.005% Distortion (THD+N)
................(Disc1&2 - With HEAD AMP)
Output Level And Impedance.................1.3V; 20ohm (Outputs)
..................160mV; 200ohm (Tape Rec.)
Headphone...........................................0.3ohm (Output Impedance)
...........................................0.25W at 8 ohm load, 1kHz, with 0.01% Distortion (THD+N)
...........................................(Power Output)
Maximum Output Level..........................8V with 0.005% distortion (THD+N), 20Hz to 20,000Hz
Voltage Amplification(Tuner,Aux,etc).......0dB (to Tape Rec)
......18dB (to Outputs)
......18dB (to Headphones)
Voltage Amplification(Disc Input)............36dB (to Tape Rec)
............54dB (to Outputs)
............54dB (to Headphones)
............(additional 26dB with HEAD AMP)
Signal To Noise....................................At rated input, 112dB (Tuner, Aux, Tape Play input)
.....................................At rated input, 87dB (Disc input [Head Amp: OFF])
.....................................At rated input, 74dB (Disc input [Head Amp: ON])
.....................................New IHF standard, 92dB (Tuner, Aux, Tape Play input)
.....................................New IHF standard, 85dB (Disc input [Head Amp: OFF])
.....................................New IHF standard, 76dB (Disc input [Head Amp: ON])
Minimum Impedance Of Output Load......1kohm (Outputs)
......10kohm (Tape Rec.)
Tone Controls(Turnover Frequency).........500Hz; ±10dB (2dB step) at 100Hz (Bass)
..........200Hz; ±10dB (2dB step) at 50Hz (Bass)
..........2kHz; ±10dB (2dB step) at 10kHz (Treble)
..........7kHz; ±10dB (2dB step) at 50kHz (Treble)
Loudness Compensator.........................COMP.1; +6dB at 50Hz
.........................COMP.2; +9dB at 50Hz
.........................COMP.3; +10dB at 50Hz, +6dB at 20kHz
Subsonic Filter.....................................17Hz cutoff 12dB/oct.
Attenuator...........................................-20dB
Power Requirement...............................Voltage selector for 100V, 117V, 220V, 240V, 50/60Hz operation
...............................Consumption: 35W
Semiconductor Complement..................85 TRs, 16 FETs, 5 ICs and 22 DI's
Dimensions(w x d x h)...........................45 x 39.5 x 12cm
Weight.................................................11kg
Miscellaneous :
Made in...............................................Japan
Condition.............................................7 / 10
Product Information :
http://www.accuphase.com/cat/c-230en.pdf (Brochure)
http://audio-database.com/Accuphase-kensonic/amp/C-230-e.html |
