¥ 315,000 (around 1975)
This is a high-quality stereo control amplifier that has been hand-made for each product. In addition to the circuit structure that has been worked out through repeated measurement and listening based on the essence of audio, almost special specifications have been developed and adopted from various mechanical parts to individual transistors.
The circuit configuration is designed with special emphasis on dynamic characteristics such as transient characteristics and rising characteristics.
The equalizer circuit has a high voltage design of 140 v to ensure a high allowable input, and employs high precision circuit elements to achieve excellent precision.
Canshield transistors and glass epoxy boards are also used to ensure long-term reliability.
The Phono2 and AUX3 jacks have built-in level controls, making it easy to adjust the level difference with other positions.
In addition, the impedance of the Phono2 terminal can be switched, so that the impedance can be selected according to the cartridge used.
Volume uses a 22-contact attenuator type.
When combined with a 3-position attenuator of 0, -15, or -30dB, it is possible to adjust the volume with the attenuation as indicated on the display and without any left-right linkage error.
In addition to the Bass and Treble main control that increases and decreases the low and high frequencies around 1 kHz, the tone control is a twin-tone control that is equipped with the SUB control that exclusively controls the ultra low and high frequencies.
The filter is a 2-stage switching type of high filter 8kHz/12kHz and low filter 15Hz/30Hz.
15 Hz uses CR and 12 kHz uses LC for 12dB/oct passive attenuation. 30 Hz and 3 kHz are active by electronic circuits and have 18 dB / dB / oct.
There is a headphone jack and level control inside the front lower subpanel.
By turning off the output switch, you can also listen to the sound through the headphones only.
An electronic muting circuit using a reed relay is built in to eliminate the clicking sound when the switch is ON / OFF to prevent the generation of unpleasant noise.
All of the knobs are carved out of pure aluminum material, and the switching torque of the number of switches is constant, giving it a luxurious feel.
Attached are measured values for each unit, ensuring reliability and high performance through complete quality control.
|Input Sensitivity / Impedance||Phono1, 3 : 2.5mV/50k Ω
Phono2 : 2.5 mV to 10mV/25, 50, 100k Ω
Tuner, AUX1, 2 : 150mV/100k Ω
AUX3 : 150 mv ～∞/ 100k Ω
Tape PB1, 2, 3 : 150mV/100k Ω
|Phono maximum allowable input (1 kHz)||Phono1, 3 : 700 mV
Phono2 : 700 mV to 1.4 V
|Output (RL = 50k Ω)||Rating : 2 v
Maximum : 15 v
|Harmonic distortion factor||0.03% or Less (Rated Output)|
|Frequency characteristic||Phono : RIAA deviation ± 0.2 dB (30 Hz to 15 kHz)
AUX, Tuner, Tape PB : 10 Hz to 90 kHz + 0 -1dB
|Tone control||1.5 dB Step Switch Type
|Filter||Low : 15 Hz (12dB/oct.), 30 Hz (18dB/oct.)
High : 12 kHz (12dB/oct.), 8 kHz (18dB/oct.)
|Attenuator||0, -15dB, -30dB|
|Semiconductor used||Transistor : 64
Diode : 36 units
|External dimensions||Width 468x Height 206x Depth 342 mm|