Technical Features
The all stage direct coupling OCL (Output Condenser Less) type IC amplifiers (output music power 68W) are installed in all the four main amplifiers to increase their performance and reliability.
When used with two speakers and a BTL (Balanced Transformer Less) connection, approximately twice as much power is obtained, than when used with only one speaker.
All the two channel program sources (record, open reel, cassette, cartridge tape, FM broadcasting, etc.) can be reproduced in the four channel fashion with the built-in QME (QM Effect) unit.
This stereo amplifier has a built-in special condenser-cartridge (model number C-401S) amplifier and consequently can be directly connected to the player, and further can be switched to the magnetic cartridge with the aid of the switch.
The level of each channel can be easily adjusted, because the accurate detection of the level of each channel is made possible by the four built-in large scale level meters.
The low-noise transistors, which are produced on the basis of the PCT manufacturing method developed by the Toshiba, are used for all transistors in this amplifier.
The reproduction of all the channel program sources is possible with this unit because two systems of input terminals for four channels are provided.
The four channel tape deck can be also used with this amplifier.
Two channel headphone may be used as well as the four channel type, (model number HR40) utilizing both the front and rear headphone jacks provided.
Condenser-Cartridge Amplifier
There are two types of cartridge, the velocity proportional type (MM, MC, etc.) and the amplitude proportional type (photoelectric cartridge, etc.). The condenser-cartridge belongs to the latter type and a special correction curve different from the conventional one is necessary. The power for the ICs in the cartridge is supplied through the ground of the input terminal R channel. This amplifier can be directly connected with the condenser cartridge (This is not the case for the photoelectric cartridge).
BTL Circuit
When the four channel amplifier is used for reproduction with two speakers, this circuit is used in order to operate the four amplifiers effectively. The output voltage of two factors of magnitude can be supplied between the output terminals of each amplifier when the one speaker is operated in phase and the other out of phase with the use of the phase reverse circuit.
Although the output power is theoretically of the four factors of magnitude from the relation, —(2V)?/R=4V?/R, that is in practice reduced to about two factors of magnitude due to losses such as the regulation of the transformer, the emitter resistance, etc.
Main Amplifier
Music Power Output (IHF):
30 W x 2 (at 8 Ω BTL. 0,8% THD)
17 W x 3 (each channel at 8 Ω , 0,4% THD)
Continuous Power Output:
26 W x 2 (at 8 Ω , BTL, 0,4% THD)
15 W x 4 (each channel , 8 Ω , 0,4% THD)
Output: IHF Music Power on x 2 (Distortion 0.8% BTL 17 W x 4 RMS. 96 W x 2 BTL. (Distortion 0.4%) 15 W x4
Distortion Factor:
Total Harmonic Distortion Factor: At rating output 0.4% At 2 W output 0.1%
Intermodulation Distortion Factor: At rating output 0.8% At 2 W output 0.2%
Frequency Response: 1O Hz - 55 kHz +0, -3 dB
Input Sensitivity and Impedance:
Main In : 0,5 V (37 k Ω )
Residual Noise: 0,8 V/8 Ω
Damping Factor: 20 (8 Ω )
Speaker Impedance: 4 - 16 Ω (BTL 8 - 16 Ω )
Pre-amplifier
Input Sensitivity and Impedance:
Phono 1 Mag : 3 mV / 47 k Ω
Phono 1 CC : 30 mV/70 k Ω
Phono 2 : 3 mV/47 k Ω
Tuner : 150 mV/47 k Ω
Aux 1 (4CH) : 150 mV/47 k Ω
Aux 2 (4 CH) : 150 mV/47 k Ω
4CH Tape : 300 mV/47 k Ω
Recording Output:
Tape Rec : 150 mV
DIN : 30 mV
Pre Out : 0,5V (Max. 4,2 V)
Frequency Response: 5 Hz - 100 kHz +0 -3 dB
Total Harmonic Distortion Factor: At rating output 0,04%
Maximum Input Voltage:
Phono Mag : 100 mV (1 kHz)
Phono CC : 1,2 V (1 kHz)
Tone Control
Bass : ±10 dB at 100 Hz
Treble : ±10 at 10 kHz
Equalizer: RIAA Standard +0,5 dB, -0,5 dB (Curve)
Signal-to-Noise-Ratio:
Phono Mag : 65 dB (3 mV)
Phono CC : 70 dB (30 mV)
Phono Aux : 80 dB (150 mV)
Power Source Voltage: AC 100/120/220/240 V, 50/60 Hz
Transistors: 5 ICs , 26 Transistors, 10 DIodes
Dimensions (W x H x D): 400 x 280 x 150 mm (15-3/4" x 11" x 4-1/2")
Weight: 7,5 kg (16 lbs)