Stereo Control Preamplifier RIAA 0,2 dB Equalization
OUR FINEST STEREOCONTROL PREAMPLIFIER
Contemporary disc recordings which feature extremely wide dynamic range make strenuous demands on all links in the reproduction chain, especially in the pre and power amplification stages. Dynamic range and other critical high fidelity parameters, such as a wide frequency response, low distortion and the ability to handle all musical signals without clipping and without an increase in noise, must also be applied to any preamplifier if one is to accurately judge its quality. Add to these the control versatility needed in a complex component set-up, and the power stability required for dependable performance, and you have described the CA-3000.
CIRCUIT CONCEPT
To maximize the qualities of every link of the circuit chain, each circuit in the CA-3000 has been constructed with newly developed unit amplifiers featuringextremely high input impedance and low output impedance. Each uses a differential amplifier at its input and an emitter-follower or a SEPP buffer amplifier at its output. From the standpoint of performance this means that an individual circuit remains unaffected by the preceding circuits. Each thus handles the applied signals with the highest accuracy and the lowest possible distortion.
EQUALIZER
The vital phono equalizer is a newly-designed unit with a packed differential dual FET amplifier (with a matched pair of low-noise FET's) at its initial stage and a Class-A complementary SEPP amp at its output. The initial stage amplifies the phono signal with high gain and passes it on to a CR filter for an extended high-frequency equalization. From the second FET amplifier is applied NF (negative feedback), boosting bass for an accurate low-frequency equalization. This CR-NF sequence eliminates the dips and peaks in the RIAA equalization curve, improves phase characteristic and adds almost no distortion. Results: crisp and realistic tonal quality from any or all of the cartridge now on the market, with maximum deviation from the RIAA curve of ±0,2 dB over a 30 to 15,000 Hz spectrum.
DYNAMIC MARGIN
A plus/minus 50 V (total 100 V) power supply voltage is applied to the phono equalizer amplifier. With its Class-A complementary SEPP output stage, the equalizer thus has a maximum phono input capability as high as 1,000 mV (input sensitivity switch at 6 mV).This design guarantees wide dynamic margin. large input signals (fortssissimo) are never clipped; small inputs (pianississimo) are never buried.
SPECIFICATIONS
TOTAL HARMONIC DISTORTION OVERALL (FROM AUX): less than 0,03% at or below rated output level
INTERMODULATION DISTORTION (79 hZ: 7,000 hZ = 4:1 SMPTE method):
OVERALL (FROM AUX) less than 0,03%
FREQUENCY RESPONSE (at rated output):
OVERALL (AUX to PRE OUTPUT) 10 to 100,000 Hz +0,5 dB - 1dB
RIAA CURVE DEVIATION (PHONO): +0,2 dB, -0,2 dB (30 to 15,000)
CHANNEL SEPARATION (at rated output 1,000 Hz)
PHONO 1: better than 60 dB
PHONO 2: better than 60 dB
TUNER: better than 60 dB
AUX: better than 60 dB
TAPE MONITOR: better than 60 dB
HUM AND NOISE (IHF):
PHONO 1: better than 70 dB
PHONO 2: better than 70 dB
TUNER: better than 90 dB
AUX: better than 90 dB
TAPE MONITOR: better than 90 dB
INPUT SENSITIVITY AND IMPEDANCE (1,000 Hz for rated output):
PHONO 1: 1,5 mV, 3,0 mV, 6,0 mV (30k ohms, 50k ohms, 100k ohms)
PHONO 2: 1,5 mV, 3,0 mV, 6,0 mV (50k ohms)
MAX. INPUT CAPABILITY (more than 1,000 mV RMS at 0,1%):
total harmonic distortion (input 6 mV)
AUX: 130 mV (50k ohms)
TUNER: 130mV (50k ohms)
TAPE PLAYBACK 1: 130 mV, (PIN)
TAPE PLAYBACK 2: 130 mV, (PIN); 130 mV (DIN)
TAPE PLAYBACK 3: 130 mV, (PIN)
OUTPUT LEVEL
RATED OUTPUT (0,003% Total Harmonic Distortion)
PREAMPLIFIER OUTPUT: 1,3 V
RECORDING OUTPUT: 130 mV
(DIN): 30 mV
MAXIMUM OUTPUT
PREAMPLIFIER OUTPUT: 8 v (0,1% Total Harmonic Distortion)
CONTROLS
BASS: +10 dB, -10 dB at 50Hz (TONE SELECTOR at 400 Hz)
MIDRANGE: +5 dB, -5dB at 1000 Hz
TREBLE: +10 dB, -10 dB at 20,000 Hz (TONE SELECTOR at 2kHz)
TONE SELECTORS
BASS: 100 Hz, 200 Hz, 400 Hz
TREBLE: 2 kHz, 4 kHz, 8 kHz
FILTERS LOW: -3 dB at 20 Hz (12 dB/oct); -3 dB at 40 Hz (12 dB/oct)
filters high: -3 dB at 7 kHz (6 dB/oct); -3 dB at 12 kHz (12 dB/oct)
MUTING: 0 dB, -10 dB, -30 dB
AC OUTLETS: Switched max. 500 watts; Unswitched total 500 watts
SEMICONDUCTORS: 103 TRANSISTORS; 4 FET's; 18 diodes ; 8 Zener Diodes; 4 ICs
POWER REQUIREMENTS
POWER VOLTAGE: 100, 120, 220, 240 V, 50/60 Hz
POWER CONSUMPTIO: 50 watts
DIMENSIONS: 460 x 178 x 373 mm (18⅛ x 7⅛ x 14⅗)
WEIGHT: 13,3 kg (29,3 lbs)Net; 15,3 kg (33,7 lbs) Packed