Difference between revisions of "Kenwood KA-80"
 
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__NOTOC__
 
__NOTOC__
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== Daten ==
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== Data ==
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{{Navigation}}
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{{navigation}}
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'''Allgemein'''
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'''General'''
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* Hersteller: [[Kenwood]]
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* Manufacturer: [[Kenwood]]
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* Modell: KA-80B (s)
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* Model: KA-80
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* Baujahre: 1981-1986
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* Type: Integrated amplifier
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* Hergestellt in: Japan
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* Years of manufacture: 1980 - 1986
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* Farbe: silber/schwarz
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* Made in: Japan
−
* Typ: Analog
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* Color: Silver, Black
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* Fernbedienung: nein
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* Remote control: no
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* Leistungsaufnahme: 350 Watt
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* Power consumption: 350 watts
−
* Abmessungen: 440 x 78 x 330 mm (B x H x T)
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* Dimensions: 440 x 78 x 330 mm (WxHxD)
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* Gewicht: 7,9 kg
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* Weight: 7.9 kg
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* Neupreis ca.: 598,00 DM
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* Original price approx.: 598 DM
  
  
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'''Anschlüsse'''
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'''Connections'''
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* Anzahl der Eingänge: 4 + 1
+
* Number of inputs: 4 + 1
−
** Phono MM (2,5 mV / 50 kOhm)
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Phono MM (2.5 mV / 50 kOhm)
 
** Tuner, Aux, Tape Play (150 mV / 50 kOhm)
 
** Tuner, Aux, Tape Play (150 mV / 50 kOhm)
−
** zusätzlich Mikrofon
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** additional microphone
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* Anzahl der Ausgänge:
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* Number of outputs:
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** 1 x Lautsprecher
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** 1 x loudspeaker
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** 1 x Kopfhörer
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** 1 x headphones
 
** Rec-Out 150mV @ 47kOhm
 
** Rec-Out 150mV @ 47kOhm
  
  
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'''Technische Daten'''
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'''Technical Data'''
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* Dauerleistung (bei Klirrfaktor)
+
* Continuous power (at distortion)
 
** 8 Ohm: 2x 48 Watt (0,02%)
 
** 8 Ohm: 2x 48 Watt (0,02%)
−
** 4 Ohm: 2x 60 Watt (0,7%)
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** 4 Ohm: 2x 60 Watt (0.7%)
−
** brachte in Tests gemessene 2 x 65W @ 8Ohm // 2 x 88W an 4Ohm
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** brought in tests measured 2 x 65W @ 8Ohm // 2 x 88W at 4Ohm
−
 
+
* Dynamic power:
−
* Dynamikleistung
 
 
** 8 Ohm:
 
** 8 Ohm:
 
** 4 Ohm:
 
** 4 Ohm:
−
* Gesamtklirrfaktor:
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* Total harmonic distortion:
−
* Dämpfungsfaktor: > 120 @ 8Ohm
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* Attenuation factor: > 120 @ 8Ohm
−
* Frequenzgang: DC - 450 kHz
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* Frequency response: DC - 450 kHz
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* Signalrauschabstand: Phono 86 dB / Hochpegel 106 dB
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Signal to Noise Ratio: Phono 86 dB / High Level 106 dB
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* Stereokanaltrennung: > 68dB
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* Stereo channel separation: > 68dB
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* Klangregelung: ja
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* Tone control: yes
 
** Bass: ± 10 dB / 100 Hz
 
** Bass: ± 10 dB / 100 Hz
−
** Höhen: ± 10 dB / 10 kHz
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** Treble: ± 10 dB / 10 kHz
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* Loudness: ja
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* Loudness: yes
−
* High Filter: Nein
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* High Filter: No
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* Low Filter (Subsonic): Nein
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* Low Filter (Subsonic): Yes - with activated tone control
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* Mute: nein
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* Mute: no
−
* Direct/Line-Straight: ja
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* Direct/Line-Straight: yes (DC-coupled)
 +
 
 +
 
 +
'''Special Features'''
 +
* Foldable front panel
 +
* Microphone mixable
 +
* Low feedback power amplifier circuit
 +
* Very high slew rate - 150V/µsec.
 +
* Test winner in many gazettes
 +
* Reference device in its class
 +
* Considered as high-end suspicious
 +
 
  
 +
== Comments ==
 +
* Other models in the same series:
 +
* Amplifier:
 +
* [[Kenwood KA-30]]
 +
* [[Kenwood KA-50]]
 +
* [[Kenwood KA-60]]
 +
* [[Kenwood KA-70]]
 +
* [[Kenwood KA-80]]
 +
* [[Kenwood KA-500]]
 +
* [[Kenwood KA-800]]
 +
* [[Kenwood KA-900]]
 +
* [[Kenwood KA-1000]]
  
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'''Besondere Ausstattungen'''
 
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* abklappbare Frontblende
 
−
* Mikrofon einmischbar
 
  
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'''Bemerkungen'''
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* [[Tuner]]
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* gegenkopplungsarme Endstufenschaltung
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* [[Kenwood KT-30]]
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* sehr hohe 'slew rate' - 100V/µsec.
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* [[Kenwood KT-50]]
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* Testsieger in vielen Gazetten
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* [[Kenwood KT-60]]
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* Referenzgerät seiner Klasse
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* [[Kenwood KT-80]]
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* galt als High-End verdächtig
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* [[Kenwood KT-500]]
 +
* [[Kenwood KT-800]]
 +
* [[Kenwood KT-900]]
 +
* [[Kenwood KT-1000]]
  
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== Bemerkungen ==
 
−
Weitere Modelle der gleichen Serie:
 
−
** [[Kenwood KA-30|KA-30]]
 
−
** [[Kenwood KA-50|KA-50]]
 
−
** [[Kenwood KA-60|KA-60]]
 
−
** [[Kenwood KA-70|KA-70]]
 
−
** [[Kenwood KA-80|KA-80]]
 
−
** [[Kenwood KA-500|KA-500]]
 
−
** [[Kenwood KA-800|KA-800]]
 
−
** [[Kenwood KA-900|KA-900]]
 
−
** [[Kenwood KA-1000|KA-1000]]
 
  
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== Bilder ==
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* [[Tape Deck]]
 +
* [[Kenwood KX-50]]
 +
* [[Kenwood KX-70]]
 +
* [[Kenwood KX-400]]
 +
* [[Kenwood KX-500]]
 +
* [[Kenwood KX-600]]
 +
* [[Kenwood KX-800]]
 +
* [[Kenwood KX-1060]]
 +
* [[Kenwood KX-2060]]
  
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== Berichte ==
 
  
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Durch Beschränkung auf das Wesentliche, sozusagen 'spartanisch' ausgestattet, in aktuellem "Slim-Line" Design, tritt dieser 'kleine' Kenwood KA-80 auf. Er bietet eine ausgezeichnete, diskret aufgebaute MM-Phono-Vorstufe mit FET-Eingang, die hochpräzise der RIAA-Kurve folgt und verzerrungsfrei hoch aussteuerbar ist. Die einzigen OP's finden sich in der Mikrofon-Vorstufe (für Karaoke!? = überflüssig) und in der Klangregelstufe, die man aus dem Signalweg schalten kann, was zu einem kompletten DC-Signalweg führt! Nicht häufig benutzte Bediengsorgane sind hinter einer Frontplatten-Klappe versteckt und verleihen dem Verstärken ein schlichtes, elegantes Erscheinungsbild. Der Vollmetallaufbau des Verstärkers ergibt ein schweres, stabiles HiFi-Gerät.
+
* [[Special accessories for this series]]
 +
* [[Kenwood AT-50]] Timer
 +
* [[Kenwood AT-80 D]] Timer
 +
* [[Kenwood AT-500]] Timer
 +
* [[Kenwood GE-80]] Equalizer
 +
* [[Kenwood PM-80]] Level meter
 +
* [[Kenwood RA-80]] Reverberator
 +
* [[Kenwood RC-500]] Remote control
  
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Die Endstufen-Hybrid-Bausteine (STK60II) des KA-80 sind keine ganz kompletten Hybridverstärker, sondern beinhalten nur Vor-Treiber/Treiber und Endstufentransistoren (plus zwecks optimaler themischer Kopplung weiterer Bauteile - Dioden und R's) und werden zu Unrecht (!) oft diskriminiert. Wen es interssiert sollte sich die interne Schaltung der STK60II und die von Kenwood gewählte Umgebungsbeschaltung ansehen: Wer etwas von Schaltungstechnik versteht, dem wird ein 'Licht' aufgehen: Alles ist seriös! Seinerzeit nicht gerade billig (598,--DM) wird der KA-80 heute gebraucht gelentlich preiswert angeboten. Dass er mit zwei Netztransformatoren ausgerüstet ist, bedeutet keinen Doppelmonoaufbau, sondern ist der flachen Bauweise geschuldet. Die Ladekapazität der Netzteils-Elkos beträgt bescheidene 2 x 7.5mF/50V (zu niedrige Spannungsfestigkeit), und lässt sich leicht auf z.B. 2 x 15mF/63V Elkos (35x50mm) aufstocken. Es gibt weitere Verbesserungsmöglichkeiten: Die serienmäßige Einstellung der Endstufen-Arbeitspunkte sind zu hoch gewählt. Das führt zu einer (zu!) starken Erwärmung des Verstärkers im Ruhezustand. Deshalb sollte der Endstufen-Ruhestrom (von einem Fachmann!) um 1/3 reduziert werden. Dies wirkt sich klanglich definitiv nicht aus, senkt aber die Ruhe-Betriebstemperatur erheblich. Zwei weitere Elkos (C105/C106) sind seitens der Spannungsfestigkeit unterdimensioniert (25V) und sollten durch 35V-Typen ersetzt werden. Die Widerstände R167/R168 (390Ohm) sollten in 470Ohm/R168 und 560Ohm/R167, jeweils mindesten 3Watt (!) ausgetauscht werden.
 
  
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Am Besten kommt der 'kleine' Kenwood mit 8 Ohm Lautsprechern mit gutem Wirkungsgrad zurecht, verträgt aber auch Lautsprecher mit 4 Ohm Nennimpedanz; inbesondere dann, wenn man die Ladeelkos wie oben beschrieben vergrößert. Lautsprecher mit Nenn-Impedanzen unter 4 Ohm sollten vermieden werden - dafür ist der KA-80 nicht ausgelegt! Klanglich bietet der Verstärker, wie übrigens auch der dazu passende Analog-Drehkondensator-Tuner KT-80, absolut seriöses, zeitgemäßes Top-HiFi. Wegen seiner Gesamteigenschaften kann man den KA-80 absolut berechtigt als "High-End" verdächtig bezeichnen. An hochwertigen (!) Lautsprechern, die in der Lage sind Versärkerunterschiede aufzulösen, spielt dieser Verstärker klanglich problemlos in der 1. Liga.  
+
== Pictures ==
 +
* Extract from brochure: Kenwood KA-80
 +
[[File:Kenwood KA-80-Prospekt-1.jpg|1500px]]
 +
 
 +
 
 +
== Reviews ==
 +
* By limiting itself to the essentials, 'spartanly' equipped, so to speak, in current "slim-line" design, this 'small' Kenwood KA-80 makes an appearance. It offers an excellent, discrete MM-phono preamplifier with FET-input, which follows the RIAA-curve with high precision and is distortion-free high driveable. The only OP's are found in the microphone preamp (for karaoke!? = superfluous) and in the tone control stage, which can be switched out of the signal path, resulting in a complete DC signal path! Not often used controls are hidden behind a front panel flap and give the amplifier a simple, elegant appearance. The all-metal construction of the amplifier results in a heavy, stable hi-fi unit.
 +
 
 +
* The power amplifier hybrid components (STK60II) of the KA-80 are not quite complete hybrid amplifiers, but contain only pre-driver/driver and power amplifier transistors (plus for optimal thematic coupling further components - diodes and R's) and are unjustly (!) often discriminated against. If you are interested you should have a look at the internal circuit of the STK60II and the environmental circuit chosen by Kenwood: If you know something about circuitry, a 'light' will come on: Everything is serious! At its time, the KA-80 was not exactly cheap (598,--DM), but today it is offered at a very reasonable price. The fact that it is equipped with two mains transformers does not mean a double mono setup, but is due to the flat design. The charge capacity of the power supply electrolytic capacitors is a modest 2 x 7.5mF/50V (too low dielectric strength), and can easily be increased to e.g. 2 x 15mF/63V electrolytic capacitors (35x50mm). There is further room for improvement: The stock power amp working points are set too high. This leads to a (too!) strong heating of the amplifier in idle state. Therefore, the output stage quiescent current should be reduced (by an expert!) by 1/3. This definitely has no effect on the sound, but it does lower the idle operating temperature considerably. Two further electrolytic capacitors (C105/C106) are undersized (25V) and should be replaced by 35V types. The resistors R167/R168 (390Ohm) should be replaced by 470Ohm/R168 and 560Ohm/R167, each at least 3Watt (!).
 +
 
 +
The 'small' Kenwood works best with 8 Ohm loudspeakers with good efficiency, but can also handle loudspeakers with 4 Ohm nominal impedance; especially if the load capacitors are increased as described above. Speakers with nominal impedances below 4 ohms should be avoided - the KA-80 is not designed for this! In terms of sound, the amplifier, as well as the matching analogue rotary capacitor tuner [[Kenwood KT-80|KT-80]], offers absolutely serious, contemporary top hi-fi. Because of its overall characteristics, the KA-80 can absolutely justifiably be suspected of being "high-end". When used with high-quality (!) loudspeakers that are capable of resolving amplifier differences, this amplifier easily plays in the 1st league in terms of sound quality.
 +
 
 +
PS: A fan must have edited my review here. To call KA-80 & KT-80 1st league is quite an exaggeration. It is styled middle class.
 +
In no case more.
 +
 
  
 
== Links ==
 
== Links ==
 +
* Review at Good Old Hifi: [http://www.good-old-hifi.de/kenwood_ka-80/]
 +
  
−
[[Kategorie:Vollverstärker]]
+
[[Category:Integrated Amplifier]]

Latest revision as of 05:38, 3 December 2020

Data[edit]

General

  • Manufacturer: Kenwood
  • Model: KA-80
  • Type: Integrated amplifier
  • Years of manufacture: 1980 - 1986
  • Made in: Japan
  • Color: Silver, Black
  • Remote control: no
  • Power consumption: 350 watts
  • Dimensions: 440 x 78 x 330 mm (WxHxD)
  • Weight: 7.9 kg
  • Original price approx.: 598 DM


Connections

  • Number of inputs: 4 + 1

Phono MM (2.5 mV / 50 kOhm)

    • Tuner, Aux, Tape Play (150 mV / 50 kOhm)
    • additional microphone
  • Number of outputs:
    • 1 x loudspeaker
    • 1 x headphones
    • Rec-Out 150mV @ 47kOhm


Technical Data

  • Continuous power (at distortion)
    • 8 Ohm: 2x 48 Watt (0,02%)
    • 4 Ohm: 2x 60 Watt (0.7%)
    • brought in tests measured 2 x 65W @ 8Ohm // 2 x 88W at 4Ohm
  • Dynamic power:
    • 8 Ohm:
    • 4 Ohm:
  • Total harmonic distortion:
  • Attenuation factor: > 120 @ 8Ohm
  • Frequency response: DC - 450 kHz

Signal to Noise Ratio: Phono 86 dB / High Level 106 dB

  • Stereo channel separation: > 68dB
  • Tone control: yes
    • Bass: ± 10 dB / 100 Hz
    • Treble: ± 10 dB / 10 kHz
  • Loudness: yes
  • High Filter: No
  • Low Filter (Subsonic): Yes - with activated tone control
  • Mute: no
  • Direct/Line-Straight: yes (DC-coupled)


Special Features

  • Foldable front panel
  • Microphone mixable
  • Low feedback power amplifier circuit
  • Very high slew rate - 150V/µsec.
  • Test winner in many gazettes
  • Reference device in its class
  • Considered as high-end suspicious


Comments[edit]





Pictures[edit]

  • Extract from brochure: Kenwood KA-80

Kenwood KA-80-Prospekt-1.jpg


Reviews[edit]

  • By limiting itself to the essentials, 'spartanly' equipped, so to speak, in current "slim-line" design, this 'small' Kenwood KA-80 makes an appearance. It offers an excellent, discrete MM-phono preamplifier with FET-input, which follows the RIAA-curve with high precision and is distortion-free high driveable. The only OP's are found in the microphone preamp (for karaoke!? = superfluous) and in the tone control stage, which can be switched out of the signal path, resulting in a complete DC signal path! Not often used controls are hidden behind a front panel flap and give the amplifier a simple, elegant appearance. The all-metal construction of the amplifier results in a heavy, stable hi-fi unit.
  • The power amplifier hybrid components (STK60II) of the KA-80 are not quite complete hybrid amplifiers, but contain only pre-driver/driver and power amplifier transistors (plus for optimal thematic coupling further components - diodes and R's) and are unjustly (!) often discriminated against. If you are interested you should have a look at the internal circuit of the STK60II and the environmental circuit chosen by Kenwood: If you know something about circuitry, a 'light' will come on: Everything is serious! At its time, the KA-80 was not exactly cheap (598,--DM), but today it is offered at a very reasonable price. The fact that it is equipped with two mains transformers does not mean a double mono setup, but is due to the flat design. The charge capacity of the power supply electrolytic capacitors is a modest 2 x 7.5mF/50V (too low dielectric strength), and can easily be increased to e.g. 2 x 15mF/63V electrolytic capacitors (35x50mm). There is further room for improvement: The stock power amp working points are set too high. This leads to a (too!) strong heating of the amplifier in idle state. Therefore, the output stage quiescent current should be reduced (by an expert!) by 1/3. This definitely has no effect on the sound, but it does lower the idle operating temperature considerably. Two further electrolytic capacitors (C105/C106) are undersized (25V) and should be replaced by 35V types. The resistors R167/R168 (390Ohm) should be replaced by 470Ohm/R168 and 560Ohm/R167, each at least 3Watt (!).

The 'small' Kenwood works best with 8 Ohm loudspeakers with good efficiency, but can also handle loudspeakers with 4 Ohm nominal impedance; especially if the load capacitors are increased as described above. Speakers with nominal impedances below 4 ohms should be avoided - the KA-80 is not designed for this! In terms of sound, the amplifier, as well as the matching analogue rotary capacitor tuner KT-80, offers absolutely serious, contemporary top hi-fi. Because of its overall characteristics, the KA-80 can absolutely justifiably be suspected of being "high-end". When used with high-quality (!) loudspeakers that are capable of resolving amplifier differences, this amplifier easily plays in the 1st league in terms of sound quality.

PS: A fan must have edited my review here. To call KA-80 & KT-80 1st league is quite an exaggeration. It is styled middle class. In no case more.


Links[edit]

  • Review at Good Old Hifi: [1]
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