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Design. The CS-1000P is a power amplifier with adjustable input sensitivity. It can also be used as an integrated amplifier with the volume controlled by a small 41-step attenuator on the front panel. This is a tube amp with a solid-state rectifier, two Electro-Harmonix 6922 input tubes and two General Electric 6CG7 in single-ended class A driving the output stage. The latter operates in class AB push-pull. It uses the KT120 beam tetrodes, a more powerful version of the KT88. Recently these have become very fashionable and are already used by such companies as Ayon Audio, Octave and others. Alternately you can use KT88, KT66, 6550A/C, 350B, EL34 and KT77.
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The overall looks of the amplifier is nearly identical to the CS-660P, however the paint is darker and prettier. The design is classic – tubes up front, transformers behind them. The output transformers and power supply choke are shielded under a single cover, with the power transformer next to them without cover. In front of the latter we see a nice mA meter showing cathode current of the power tubes. The meter is made by "an established Japanese company" as we read in the brochure. In front of the meter we have a selector knob to choose which tube’s bias current we adjust and finally four multi-turn potentiometers. The inclined front panel sports a mechanical power switch and illuminated label that reads "A Motion Sound".
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On the back panel we have nice speaker terminals and between them a selector for 4, 6, 8 and 16Ω output tabs. It’s a really nice arrangement. To one side of the terminals are exceptionally solid RCA inputs from Canary, to the other is a large toggle switch to set operating mode - normal tetrode (pentode position) or having the output tubes’ screen grids connected directly to the plates in triode mode. On the left side there is the mains socket and fuse. The amplifier stands on solid brass feet with microporous rubber.
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The interior looks unusual because it’s a study in simplicity. Very evidently Mr. Taku chose to eliminate a lot of parts from the main and auxiliary circuits to pursue maximum simplicity instead. You really need extensive experience for that to come off. The input signal proceeds via Million model cables from the Japanese company Kyowa Ltd. to the Alps Blue Velvet potentiometer on the front panel. The pot’s chassis is grounded with signal mass soldered to one of the screws. From the pot the signal goes to the input stage tubes operating in SRPP where one half of the triode works as a load instead of a passive circuit with a resistor and capacitor. Here we see tantalum resistors. The signal then goes to the driver tubes coupled to the output tubes with polypropylene Mundorf capacitors. These are cathode not anode coupled. All resistors are of a precision metal-grade type. All tube sockets are from the Japanese Omron company. As a matter of fact most components are Japanese.
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The power supply design is interesting. No filament current is rectified but we have separate transformer windings for the input tube filaments and for each channel’s output tube filaments. Bias current is rectified and filtered. The anode power supply is common to all tubes and a textbook series of pi filters with chokes and resistors.
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Technical data (according to the manufacturer):
Power output: pentode mode 2 x 100W (1kHz) | 2 x 65W (maximum power full bandwidth); triode mode 2 x 70W (1 kHz) | 2 x 35W (maximum power, full bandwidth)
Frequency response: pentode mode 10 Hz – 150 kHz (-3 dB), triode mode 10 Hz – 120kHz (-3 dB)
Input impedance: 100kΩ
Noise level: 0.7 mV
Input sensitivity: pentode mode 0.4 V/50W, triode mode 1.9 V/50W
Distortion: pentode mode 0.4% (30W/1 kHz), triode mode 1% (30W/1kHz)
Dimensions: 455 x 200 x 335mm WxHxD
Weight: 23.5kg
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opinia @ highfidelity.pl
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