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What is stereo?
There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.
H.H. Scott '59
Kyocera R-861
Kyocera R-661
Kyocera R-461
Kyocera PL-910
Kyocera R-851
Kyocera C-910 (1983)
The first control pre-amplifier based on digital age technology and space age materials.
Features
Single Stage Push-pull circuitry improves open-loop performance and requires minimal use of negative feedback.
Separate input level and output volume controls near the final stage achieve the best signal-to-noise ratio and dynamic range.
Ceramic Compound Resin base chasiss isolates unwanted vibration both from internal and external sources.
Built-in MC Head amplifier is encased in a completely separate block, shielded with non magnetic material.
Only select circuit components used, from ceramic capacitors to film capacitors to achieve atmost sound quality.
Newly developed Fine Ceramic Linear module preserves sound quality by preventing unwanted vibration and DCdrift.
Top-quality Linear Crystal Oxygen-Free Copper wires are used to minimize signal loss through cable wires.
Digital program sources are virtually free of noise, with dynamic ranges in excess of 90 dB. For a pre-amplifier to cope with this unprecedented audio quality required the full refinement of conventional audio techniques as well as a totally fresh approach to improving performance.
The C-910's circuit design begins with a highly simplifield all Direct-Coupled (DC) Single Stage Push-pull (SPP) amplifier configuration that eliminates the second voltage amplifier stage of the output section. The SSP circuit maximizes the advantages innerent in a MOS-FET circuit, but also provides a very high slew rate exceptionally smooth open loop response wide dynamic range and maximum signal-to-noise ratio. No capacitors are used for stage coupling which eliminates a principle cause of sonic coloration. The entire SSP circuit is then encapsulated in Kyocera's proprietary Fine Ceramic Linear (FCL) module to counter Microphonic Effect and to eliminate instability due to temperature variations. Unwanted vibrations are reduced further by mounting all the C-910's circuitry directly to a high-density, non-resonant Ceramic Compound Resin (CCR) chassis. The Kyocera C-910 lets nothing interfere with accurate sound reproduction.
Specifications
Input sensitivity/impedence:
Phono (MM) : 2,2 mV/47 kΩ
Phono (MC High) : 0,1 mV/60 Ω
Phono (MC Low) : 0,1 mV/30 Ω
High Level : 125 mV/25 kΩ
Phono max. input voltage: 300 mV (MM); 15 mV (MC)
Output level/impedance:
Rec out : 125 mV/560 Ω
Pre out : 2V/300 Ω, 25 V max.
Total harmonic Distortion: 0,003% (10 V)
Frequency response: 20 Hz to 20 kHz (±0,1 dB). DC= 200 kHz (+0/-3 dB)
Signal-to-noise ratio:
Phono (MM) : 85 dB
Phono (MC) : 76 dB
High level : 106 dB (IHF - A)
Dimensions (W x H x D): 430 x 140 x 330 mm (17" x 5½" x 13")
Weight: 10 kg (22 lbs, 12 oz)
Kyocera B-910 (1983)
Kyocera's DC high-speed power amplifier features dynamic power supply
for maximum power and sound quality.
Like its matching pre-amplifier, the C-910, Kyocera's B-910 Power Amplifier begins by taking conventional amplifier design a few significant steps forward. It uses a CCR base chasiss and an FCL module for the input stage both for the purpose of eliminating resonance. It is designed to deliver a continuous power output of 150 W per channel into an 8 ohm load or 200 W per channel into a 4 ohm load - more than enough to handle the sudden power surges that are often required for digital program sources. The high power and high current delivery ability of the B-910 is made possible by a huge power transformer to perform to its full potential an oversized honeycomb heat sink of very high rigidity has been included to effectively dissipate all heat.
In the B-910 traditional two-stage voltage amplification has been replaced by an Single Stage Push-pull (SSP) circuit that eliminates the second voltage amplifying stage. This and an output stage without a negative feedback loop combine to create the widest possible dynamic range in a power amplifier. The B-910 then uses Kyocera's proprietary Fine Ceramic Linear (FCL) module and Ceramic Compound Resin (CCR) base to prevent unwanted temperature variations from adversely effecting the amplifier's most critical circuitry.
Features
Utilization of a newly developed FCL module avoids sound quality deterioration due to unwanted vibration and DC drift.
High 150 W per channel at 8 ohm, 200 W per channel at 4 ohm.
Single Stage Push-pull circuit improves open-loop performance and requires minimum use of negative feedback.
Powerful over-sized power supply transformer with 600 VA core volume.
DC high-speed amplification
Power transistors with 900 W
High input impedance MOS_FET driver stage
Non-negative feedback output stage
CCR base chasiss shutt out unwanted vibration both in terms of material and structural design
Oversized resonance free heat sink efficiently dissipates heat
Specifications
Rated output power (both ch. driven 20 Hz-20 kHz): 150 +150 W (8 Ω), 200 + 200 W (4Ω)
Input sensitivity/impedance: 2.0 V/30 kΩ
Total Harmonic Distortion: 0.02% (at 8Ω); 0,03% (at 4Ω)
Frequency response: DC - 200 kHz (at 1 watt -3 dB)
Signal-to-noise ratio: 120 dB
Dimensions (W x H x D): 430 x 210 x 400 mm (17" x 8¼" x 15¾")
Weight: 27 kg (59 lbs, 8 oz)