Audio Database Accuphase C-200X 270,000 yen(June, 1980 release) 280,000 yen(January, 1983 amendment) Description Stereo control amplifier which introduced the newest technology and gave the extensive improvement based on C-200 and C-200S. Based on all the magnification stage push pull systems, the dregs cord bootstrap push pull difference input system is adopted. By dregs cord bootstrap, while obtaining a big gain, the high region characteristic is improved, and aggravation of the distortion by the rise of input impedance is also improved simultaneously with it. This circuit is used for equalizer amplifier and high level tone control amplifier. direct-current servo system is adopted as equalizer amplifier and high-level tone control amplifier, and it is considered as direct connection perfect from MM disc input to an output. IC is used for direct-current servo amplifier, and the output of IC has adopted the method of not controlling the signal system of difference input amplifier directly, but controlling the base current of a current generator. In this servo circuit, it can suppress to the minimum that the noise of a servo system influences a signal system, and excels in direct-current drift control capability. For this reason, the effect which was excellent even if it used it for the high equalizer amplifier of a low-pass profit can be acquired. The head amplifier part consists of an input of a differential push pull, and an output circuit of RET pure complimentary. Moreover, the input unit which affects sound quality is taken as the direct connection system which does not use a capacitor. The multiple power supply system which arranges the independent constant-voltage power source by RET and IC is adopted as a total of each six right and left of head amplifier, equalizer amplifier, and high-level amplifier. These are arranged at the near place of the circuit, respectively, and since they hold low impedance over a still larger zone, they are suppressing interference between each unit. The amplifier only for direct-current AClass composition pure complimentary direct connection is used for a headphone amplifier part. Between unit amplifier and the power-source part, and the mother board system performed to combination of a function in part in a print circuit are adopted. The socket which carries out plug-in of each unit amplifier, a power transformer and a commutator, the filter capacitor, and the push switch of the front panel are mounted by the mother board of glass epoxy. Each portion is connected with the conductor route formed into the print circuit, it is lost with the rose of the characteristic by the unevenness of leading about which tends to take place with wire wiring, and the uniform engine performance is obtained. The 2dB step system by a right-and-left independent type 11 contact rotary switch adopted since C-200 is adopted as a tone control part. The turnover changeover switch is also prepared and the ON-OFF switch of which tone control is canceled is also carried. Hearing impression at the time of the amount reproduction of low-pitched sound is rectified, and the loudness Compensation which prepares energy balance is carried. It is possible to choose two kinds of curves according to the characteristic of a regeneration level or a listening room. The Subsonic Filter and the high filter are carried. - Carry the function of an Attenuator switch of 20dB, the mode switch by 5 contact rotary switch, a disc input impedance changeover switch, an output ON-OFF switch, etc., etc. There was a wood case as an option. Rating of a mode Form Stereo control center Frequency response (new IHF) highlevel: 20Hz-20kHz+0 -0.2dB disc: 20Hz-20kHz�}0.2dB THD (new IHF) 0.005% or less (20Hz - 20kHz) Input sensitivity/impedance (An Output power / new IHF0.5V output) disc1, discFront MM:2.0mV/0.5mV/100, 47k and 82k, 150kohm (head amp off) disc2 MM: 2.0mV/0.5mV/47kohm (head amp off) disc MC: 0.1mV/0.025 mV/100 ohms (head amp on) tuner, aux, and tape play:126mV/31.5mV/47kohm An Output power/Output load impedance output: 2.0V/2 ohm tape rec: 126mV/200 ohms (at the time of a disc input) Headphone jack Output load impedance: 0.3ohm Output: 0.25W (8 ohms, 1kHz, 0.01% of distortion) S/N disc(head amp off): 85dB (a rated input, input short-circuit, A compensation) 82dB (new IHF) disc(head amp on): 72dB (a rated input, input short-circuit, A compensation) 74dB (new IHF) tuner, aux, tape play : 110dB (a rated input, input short-circuit, A compensation) 88dB (new IHF) Input conversion noise disc(head amp off):-139dBV disc(head amp on):-152dBV tuner, aux, tape play:-128dBV Maximum-except-take-off level 10V (0.005% or less of a distortion, 20Hz - 20kHz) The disc maximum input (1kHz, 0.005% or less of distortion) head amp off:400mVrms head amp on:20mVrms Minimum load impedance output: 1kohm tape rec: 10kohm Gain tuner, aux, tape play-> tape rec:0dB output:24dB disc(head amp off) -> tape rec:36dB output: 60dB (at the time of head amp on: +26dB) Tone control The step type by 11 contact rotary switch Turnover frequency Low-pitched sound: 200Hz, 500Hz Loud sound: 2kHz, 7kHz Low-pitched sound 500Hz : �}10dB (100Hz), a 2dB step 200Hz : �}10dB (35Hz), a 2dB step Loud sound 2kHz : �}10dB (10kHz), a 2dB step 7kHz : �}10dB (35kHz), a 2dB step Loudness Compensation (Volume -30dB) comp1:+3dB(100Hz) comp of 2:+10dB (100Hz), +5dB (20kHz) Filter Subsonic Filter: 17Hz, -12 dB/oct A high filter: 8kHz-12 dB/oct Attenuator -20dB The semiconductor used Transistor: 102 pieces FET: 29 pieces IC: 11 pieces Diode: 50 pieces Power source AC100V/117V/220V/240V, 50Hz/60Hz Power consumption 80W a Dimensions (a piece -- it includeds) At usually, the time: Width 445x height 160x depth of 373mm At the time of wood case wearing: Width 466x height 190x depth of 385mm Weight 13.4kg Option Wood case A-8 (16,000yen)