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The non-feedback discrete amplifier circuit of SA1.0 has been thoroughly reviewed and rebuilt. By improving the drive power of the voltage amplification stage and at the same time reducing the input load on the final stage, we have achieved a wide range while improving drive power across the entire band.
A-0 has two balanced input systems. The balanced input signal is not unbalanced, but is selected as balanced, volume adjusted, and transmitted to the differential input of the voltage amplification stage.
It follows the non-contact signal system adopted in the higher-end model A-1. Connectors are eliminated from the balanced input to the speaker output, making it contactless.
Moved the gain selector switch to the front panel. In addition, the volume circuit has been revised to minimize changes in sound quality due to gain switching, dramatically improving the dynamism of the sound even at low volumes. By selecting low gain when listening at low volumes, more detailed volume adjustment is now possible.
A new switch has been added to select between speaker output and pre-out output. You can easily switch between two systems: the speaker connected to the A-0, and the power amplifier & speaker connected to the pre-out.
Renewed with a new design while keeping the basic concept of sa1.0. The sound quality and functions have also been upgraded.
■Super powerful pre-out & headphone output
Both the pre-out and headphones are output directly from the same non-feedback discrete power amplifier as the speaker output. Since it can drive speakers, it can be called a super powerful preamplifier/headphone driver.
■High quality output stage
By intentionally suppressing the maximum output to 10W, which is sufficient for general home use, it is possible to use a transistor (2SA1930/2SC5171) with excellent frequency characteristics, linearity, and completion accuracy in the final stage.
By using this in a single push-pull mode, transparent and dynamic sound quality is achieved.
It can be said to be a "power unpress" method that drives speakers with pre-out quality.
■Multi-heat sink method
In A-0, the heat capacity of the heat sink is twice that of sa1.0. In addition, by separating the heat sinks between the final stage and driver stage and configuring temperature compensation circuits tailored to each stage, the stability of idling current has been greatly improved, making it possible to achieve both a sense of dynamism and a sense of comfort.
■Ideal construction & pattern layout
By adopting a full-size chassis, we have achieved the ideal construction refined with A-1. By minimizing the current return loop from the transformer to the rectifier circuit, creating the ideal shortest layout from the power supply circuit to the amplifier circuit, and using star wiring for the ground pattern, the audible S/N and sound reality have been significantly improved.
■Direct mechanical earth construction
By installing a spike pin directly under the transformer, harmful transformer vibrations are released directly to the outside of the chassis. In addition, by supporting the product's legs at three points with spike pins, we eliminate the muddiness of the sound caused by chassis dumps and obtain a lively, soulful sound.
■Equipped with metal standard insulator (at time of shipment)
Starting with this product, we have abolished the plastic insulator that was previously standard and have adopted a metal insulator.
■Product specifications
output:
Speaker: 10W×2(8Ω),
Headphones: 3.0W×2(32Ω),
Pre-out: 2.0V (10kΩ)
Total harmonic distortion:
Speaker: 0.2% (10Hz-100kHz 3.3W 8Ω),
Headphones: 0.03 (10Hz - 100kHz 200mW 32Ω),
Pre-out: 0.005% (10Hz-100kHz 2V 10kΩ)
Frequency characteristics: Speaker (8Ω 1W): 5Hz - 350kHz (+0/-1dB),
Headphones (32Ω 200mW): 5Hz - 400kHz (+0/-1dB),
Pre-out (10k Ω2V): 5Hz - 400kHz (+0/-1dB)
Input sensitivity/impedance:
LINE1,2:0.775V/10kΩ(H), 4.0V/50kΩ(L),LINE3,4:0.775V/5kΩ(H), 4.0V/25kΩ(L)
Total gain: H: 22dB, L: 8dB
S/N ratio: 115dB (IHF A network)
Power supply voltage: AC100V 50/60Hz
Power consumption: 31W (J60065), 20W (when idling)
Maximum external dimensions: Body: 430(W)×102(H)×418(D)mm
Mass: 8.0kg
