Accuphase c 200 brochure

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A good control center must be able to preamplify program source
signals faithfully without changing their characteristics. It must also be
able to provide compensation, when required, for room acoustics or
deficiencies in program source signals. To satisfy the first requirement of
fidelity. a good control center must have excellent characteristics such
as wide dynamic range, flat frequency response, low noise and low
distortion. as well as the ability to amplify and deliver a true replica of
the input pulse signal. As for its second function of supplying
compensation, it must have excellent equalization and other circuitry

that can be finely adjusted, as well as efficient filters to cut off noise.
Moreover. a good control center must have plenty of input connectors,
and its controls should be well laid out to avoid complexity.

The Accuphese 0200. which was designed to serve as a top class control
center, easily meets all these requirements, and more. Every stage is
push-pull driven and powered by dual power supplies. input voltages up
to :100 mVrms can be handled, a maximum for equalizer amplifiers. Its
10 inputs and 7 outputs, and a total of 28 controls attest to its functional
diversity. Yet it is simple to operate. Excellent design and full utilization
of its front and front-sub panels have made this possible.

ORIGINALITY MARKS EOUALIZER CIRCUITRY

(a) Differential amplification~pushvpull circuitry throughout
Direct-coupled, complementary symmetrical circuit in every stage assures
very excellent fidelity and outstanding stability.

(b) Easily handles dynamic range inputs

Employment of complementary-symmetry Class A driver amplifier in the
final stage and use of plus. minus dual power supplies enable the 0200 to
handle wide dynamic range inputs as large as 400 mVrms at 1 kHz with
distortion ratio less than 0.05%. This rating applies with the equalizer
amplifier gain set at 40 d8. If it is set to 30 dB. input voltages up to l.2
Vrrns can be handled.

in) Low enhancement circuit has fine adjustment of "presence

The C-200 is equipped with 8 LOW ENHANCE switch which accentuates
rich bass tones that add to music enjoyment. This switch offers selection
of 0. +0.5 and +1 dB change against the RIAA characteristic curve at 100
Hz.

(d) Disc input level control has 10 d8 variation

A 10 dB continuously variable attenuator is available to attenuate
cartridge output, when excessive, to a suitable level. It also permits
comparison of cartridges connected to DISC 1 and DISC 2, and
equalization of their levels.

(9) Disc input has impedance matching switch

The 0200 is equipped with an impedance matching switch- which
provides selection of 30 K, 47 K and 100Kohms input impedanoes at
DISC 1. This makes impedance matching easy, especially to moving coil
cartridges connected through step-up coupling transformers that require
different Optimum impedances depending on the make. It eliminates
mismatching impedances at disc input connections which deteriorate
sound quality.

if) Subsonic filter prevents intermodulation distortion

Subsonic vibrations of the turntable motor, etc., when playing records,
should be cut before they can enter the input since they may otherwise
cause intermodulation distortion. The C-200 has a subsonic filter that
provides this sharp cutoff at 25 Hz.

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WIDE CHOICE OF TONE VARIATION

(a) lOvstep bass control, plus two turnover frequencies

Every shade of bass tone variation is at your fingertips with the 0200
which offers iO-step rotary switch control for each channel, plus a choice
of 200 Hz or 400 Hz turnover frequencies. These turnover frequencies
provide a variation range of :10 dB lat 100 Hz for 400 Hz turnover. at
50 Hz for 200 Hz turnover).

(b) 10-step treble control, plus two turnover frequencies

Likewise every shade of treble control is also available through 10-step
selection for each channel. plus choice of 2.5 kHz and 5 kHz turnover
frequencies that provide a variation range of 1 10 dB (at 10 kHz for 2.5
kHz turnover, 20 kHz for 5 kHz turnover).

An independent switch is provided to turn the tone control circuit ON or
OFF.

LOW, HIGH FILTERS

(a) Low Filter with lBdB/oct cut-off at 30 Hz

The 0200 has a built-in low filter which can cut off at 18 dB/oct, all
subsonic vibrations below 30 H2 which are likely to cause inter-
mOdulation distortion.

(b) High Filter with 12 dB/oct cutoff at 5 kHz

It also has a 12 dB/oct cut-off High Filter for 5 kHz which very
effectively cuts high frequency noise without essentially affecting music
quality.

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PLENTY OF INPUT/OUTPUT CONNECTORS

A total of 10 inputs and 7 outputs are available. whiCh should meet the
needs of any assortment of program sources or sound equipment test
conneCti'ons. Of: these. 3 inputs MIC. AUX and TAPE PLAY. and three
outputs, TAPE REC, MAIN OUTPUT, and HEADPHONE are con-
veniently available on the front sub-panel.

THREE TAPE RECORDERS CAN BE CONNECTED

Inputs and outputs for connecting three tape recorders are available, of
which mo can be used for tape copying from one tape deckvtothe other.
This function can be carried on while simultaneously listening to a
different program source, since an independent tape copy switch is
provided.

COMPLEMENTARY-SYMMETRY CIRCUIT HEADPHONE AMP.
A directvc0upled, complementary-symmetry circuit amplifier. made
available exclusively for headphone use, upgrades the quality of
headphone reproduction that is available through the 0200.

WELL REGULATED POWER SUPPLY

The well-regulated power supply is fully capable of supplying steady.
non-fluctuating voltages to all amplifier stages and it is totally unaffected
by any kind 'of input signal. This power supply is also capable of
well-regulated performance even against reasonable AC line voltage
fluctiations.

SPEAKER SWITCHING THROUGH OPTIONAL RELAY BOX
In installations where the power amplifier may not be close at hand.
speaker selection is possible through the C-200's front panel Speaker
Selector switches when a Relay Box (optional equip.) is connected.

GUARANTY SPECIFICATIONS

PERFORMANCE GUARANTY:
Products of Aocuphase guarantee specifications stated.

FREQUENCY RESPONSE:
High level input: +0, -0.2 dB 20 Hz to 20,000 Hz
Low level input: +0.2, -0.2 dB20l-iz to 20,000 Hz

DISTORTION:
Lower than 0.05% at rated output level. 20 Hz to 20,000 Hz_

INPUT SENSITIVITY AND IMPEDANCE:
Disc 1: 26mV"; 30 k ohms, 47 k ohms, 100 k ohms
Disc 2: 2-6mV': 42 It ohms
Mic: 2mV; 47 k ohms
Tuner: 200mV; 130 k ohms
Aux 1, 2, FRONT: ZOOmV: 130 it ohms
Tape Play I, 2 FRONT:200mV:130 k ohms
( 256mV Variable)
MAXIMUM INPUT FOR DISC INPUT:
400mV RMS at disc level control mixlmum for 1 kHz.
1.2V HMS at disc level control minimum for 1 kHz
400mv - 1.2Vrms distortion 0.05% at 1 kHz

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OUTPUT LEVEL AND IMPEDANCE:
Main Output: 2.0 ; 200 ohms
Headphones: 0.4V: 0.3 ohms
Tape Rec. 1. 2, FRONT: 200mV;.200' chme
Mono Output: 0.42V;_38 k ohms
("at rated input, volume control maximum)

MAXIMUM OUTPUT LEVEL:
10 Volts at 0.05% distortion

VOLTAGE AMPLIFICATION IN DECIBELS:
Tuner. Aux, Tape Play input:
to Main Output: 20 dB
to Tape Rec.; 0 dB
to Headphones: 6 dB
Disc 1, Disc 2 and Mic Input (at .1 kHz):
to Main Output; 60 dB
to Tape Rec; 40 dB
to Headphones;l46 dB -

HUM AND NOISE:
Tuner. Aux, Tape Play:
Disc, Mic:

TONE, Controls:
10-step Rotary: Switch for each channel with turnover frequency
Switches. .

BASS:
Turnover frequency 400 Hz:
Turnover frequency 200 Hz:

TREBLE:
Turnover frequency 2, 500 Hz: 110 dB (2 dB step) at 10,000 Hz
Turnover frequency 5 .000 Hz: :10 dB (2 dB Step) at 20,000 Hz.
DISC LOW ENHANCEMENT Ifor Disc input):
OdB, +0.5 dB. +1 dB at 100 Hz to RIAA standard characteristics.
Bass tone becomes richer when switched to +0.5 dB or 1 dB.

COMPENSATOR:
,ON position boosts low frequencies for low level listening.
+9 dB at 50 Hz (at volume control -30-dB)

90 dB below rated Output.
74 dB below IOmV input.

:10 d8 (2 dB step) at 100 Hz
110 dB (2 dB step) at 50 Hz

FILTERS:
Disc Subscnic' Filter: 25 Hz cutoff 6 dB/oct
Low Filter: 30 Hz'cutoff 18 dB/oct
High Filter: 5.000Hz cutoff 12 dB/oct

VOLUME OONTRO L:
Less than 1 dB tracking error control down to -60 dB.
POWER REQUIREMENT:
Voltage selector for 100V. 117V, 220V. 240V 50/60 Hz operation
Consumption: 36 Watts
SEMICONDUCTOR COMPLEMENT:
80 Transistors, 35 Diodes
DIMENSIONS: .
445mm (1716 inches) Wide. 152mm I6 Inches) high. 355mm (14 in-
chesIdeep
WEIGHT: .
14 kgr. (30.8 lbs.) net. 18.3.kgr. (40.6 lbs.) in shipping carton.

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' - DISC FREQUENCY CHARACTERISTICS

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INPUT DISC

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---DISC LOW ENHANCEMENT IMO I *k
----- -DISC LOW ENHANCEMENT 10.5d8 _" ' ' ' ' ' ' '

DISC LOW ENHANCEMENT IOdB I

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20 5 100 3 5'1K "3'10K20K
FREQUENCY in Hz