Kenwood ka 7000 amplifier circuit
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.
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Kenwood R-SG7 Service Manual page 5
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.
Scott ' Posta un commento. Pagine Home New Classic Disclaimer. What is stereo? Kenwood KA A far higher grade stereo amplifier than any previous Kenwood model, the KA is a tribute to Kenwood's philosophy that only the purest sound satisfies listener's ears.
By use of the direct coupling circuitry with pure complementary-symmetry driver stage, which means all interstage coupling capacitors are eliminated, its sound quality is purified to ensure ideal frequency response, very lowest Im distortion and improved damping factor characteristics. The KA's superiority has been finally verified and guaranteed through the series of listening tests as well as through the technical measuring and simulations.
That means every figure, every feature of KA is hundred percent alive. All stages direct coupling circuitry and pure complementary symmetry driver stage ensure superb frequency response, ultra-wide power bandwidth, large damping factor, lowest IM distortion, etc. Improved NF type equalizeer stage for wide dynamic range.
Impedance selector for phono input 30 or 50 Kohms. Low level phono input 0,06mV. Exclusive Null Balancer brings perfect stereo balance. Tape monitor and dubbing switch for 2 tape decks. Pre-amplifier output jacks and main amplifier input jacks. Excellent Frequency Response. Since KA employs full stage direct coupled circuit in the main amplifier unit, without coupling capacitors, DC amplification becomes almost possible. Frequency response is, therefore, largely improved and other various characteristics are enhanced with sufficient feedback.
The output impedance is always flat, from ultra-low frequency to high-frequency, and has no boost in low frequency range due to output capacitor. In an asymmetrical power supply using output capacitors, the maximum output decreases in the ultra-low path range due to limited capacitance. The power supply in KA is symmetrical on both upper and lower sides. The output in the ultra-low path range will not decrease and the output is always stable.
Since transistor functions are the same in the upper and lower half cycle of the input signal, cross-over distortion and switching pulse components can be eliminated, which has been inevitable in conventional semi-complementary circuits. Consequently, distortion at the low output level becomes very small. High Damping Factor. This eliminates deterioration of mechanicalstatic due to a direct current flowing in the voice coil of the speaker.
Also, this differential amplification is done in the direct coupled circuit, good phase characteristics are attained. And damping factor with reference to the speaker is improved up to 45 at 8 ohms without descending down at lower frequency range.
The equalizer circuitry is made up of 3-stage direct coupled, NF-type having a wide dynamic range. This was developed from the circuitry in the KA whose excellent characteristics and power voltage, a wide dynamic range is obtained. Precise Tone Controls. Tone control is variable in 2dB steps. In order to eliminate slight osoillation at flat position, the cancellation can be operated by both level control knob and the independent defeat switches.
Protection Circuit. Asthe main unit consists of direct coupled circuits, the protection circuit differs from conventional layouts in which the first stage power supply is disconnected.
This type system suppresses current to the output transistors by PC detection system using a current limiter through which no input signal is applied in the driver stage when large current flows to the output transistor. When this protection circuit operates, no DC voltage is produced at the output terminal. Sharp Cut Filter. In order to eliminate noise due to resonance of arm, motor noise wow and flutter, scratch, etc.
Also, in order to prevent schock noise created during switch operation, strictly selected tantal solid capacitor with a leak current below 1 mA is used. Mode Switch For 4-channel Reproduction.
Perfect Balance Control System. In order to obtain left and right output balance, a sound source has been conventionally set to the center of the right and left speakers by setting Mode to Mix. In the KA a null balance system has been adopted so that sound is disappeared when right and left levels become even, as a result, total balance from the cartridge to the amplifier can be fully obtained by manipulation of the Null Balance while playing monaural disc.
Unlimited Capability and Usability of KA The concentrated terminals on the rear panel show the KA is capable for all the program sources and has wide usability which meets any of the critical audiophile' requirements. The KA is able to play the leading role of the highest music system. Phono 1 - Connect moving magnet type cartridge.
Load impedance is switchable 30 or 50 kohms. Phono 2 - Input sensitivity of 0,06 mV. Low output moving coil type cartridge can be dirctly connected. Mic - By 2 microphones, stereophonic reproduction is enjoyable. In case one mike is used, the sound is made monaurally from both speakers. With Mode Switch equipped on the front panel, KA can control 4-channel music system.
At separate side, they are individually separated. Tape Recorder - 2 pairs of tape-play and tape-rec jacks and 2 DIN connectors.
Speakers - 3 pairs of speaker system are connectable. Selector switch on the front panel offers 5 varietes of thier combinations. AC Outlets - 3 switched outlets for total watts and 1 unswitched for watts. Continuous Power Output each channel driven :.
Continuous Power Output both channel driven :. Sensitivity for tared output at 8 ohms load :. Phono 1 : 2,5 mV. Phono 2 : 0,06 mV or 2,5 mV.
Tuner, Aux 1, 2 : mV. Tape A, B : mV. Main amp input : 1 V. Input Impedance at 1 kHz :. Phono 1 : 30 or 50 kohms. Phono 2 : ohms 0,06 mV ; 50 kohms 2,5 mV.
Mic : 50 kohms. Aux 1, 2 : kohms. Tape A, B : kohms. Main amp input : 50kohms. Signal-to-Noise Ratio below rated output :. Phono 1 : 65 dB. Phono 2 : 45 dB 0,06 mV ; 65 dB 2,5 mV. Aux, Tuner, Tape : 77 dB. Noise at minimum volume control 0,5 mV at 8 ohms or 0, milliwatts. Damping Factor: 90 at 16 ohms load; 45 at 8 ohms load. Low Filter for rumble : 80 Hz and 40 Hz cutt-off, 12 dB per octave. High Filter for scratch : 7, Hz cut-off, 12 dB per octave. Turnover roll off freq:. Bass : Hz, Hz, defeat.
Treble : 2 kHz, 6 kHz, defeat. Power Consumption: 15 watts at no signals , watts at full power. AC Outlets: 3 switched, 1 unswitched. Weight: 10 kg 22,1 lbs. Nessun commento:. Iscriviti a: Commenti sul post Atom.
Announcement
The top-of-the-line integrated amplifier in the Kenwood "Purist" Series is the KA, rated at watts per channel into 8-ohm loads from 20 to 20, Hz with no more than 0. The most unusual feature of the KA and of the two less expensive amplifiers in the Purist Series is Sigma Drive, an auxiliary negative-feedback arrangement that includes the speaker cables within the loop. The result, as Kenwood puts it, is to "effectively place the amplifier across the speaker terminals. In addition to two heavy conductors for the speaker drive, these cables include a pair of lighter-gauge wires to carry the feedback signals from the speaker terminals to special Sigma Drive binding posts in the rear of the amplifier.
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Kenwood Ka 5500 Service Manual
We've often referred to a stereo amplifier as the heart of a hi-fi system, the rug that knits a system together. Considering its importance, it pays to pick a good one. A less than adequate performer could bring a system's potential down by a couple of notches. This list of the best stereo amplifiers of What Hi-Fi? Big or small, budget or high-end, functional or stylish, these amplifiers have left an indelible impression. MORE: Best stereo amplifiers
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Kenwood Ka V7000 Service Manual
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