Difference between revisions of "Pioneer A-757"

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__NOTOC__
 
__NOTOC__
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==Daten==
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== Short description ==
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{{Navigation}}
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Still with copper chassis and horizontal PCB section. The only noticeable difference to the Pioneer A-717 MKII: Smaller knobs now made of aluminium instead of plastic.
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'''Allgemein'''
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==Data==
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* Hersteller: [[Pioneer]]
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{{navigation}}
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* Modell: A-757
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'''General'''
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* Baujahre:
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* Manufacturer: [[Pioneer]]
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* Hergestellt in: Japan
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* Model: A-757
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* Typ: Vollverstärker
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* Type: Integrated amplifier
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* Fernbedienung: Nein
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* Years of manufacture: 1989 - 1990
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* Leistungsaufnahme: 820 W (max)
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* Made in: Japan
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* Abmessungen:  
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* Color: Black
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* Gewicht: 19,5 kg
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* Remote control: No
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* Farbe: schwarz
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* Power consumption: 820 W (max)
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* Neupreis ca.: 1.000 DM
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* Dimensions: 420 x 435 x 162 mm (WxDxH)
 +
* Weight: 19,5 kg
 +
* Original price approx.: 1'000 DM
  
  
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'''Anschlüsse'''
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'''Connections'''
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* Anzahl der Eingänge: 8
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* Number of inputs: 8
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** DAT /TAPE 1, TAPE 2, ADAPTER1/ TAPE3, ADAPTER 2, CD, TUNER, LINE, PHONO  
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** DAT /TAPE 1, TAPE 2, ADAPTER1/ TAPE3, ADAPTER 2, CD (gold plated), TUNER, LINE, PHONO (gold plated)
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* Anzahl der Ausgänge: 2
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* Number of outputs: 2
 
** TAPE 1/CD-R/MD, TAPE 2 MONITOR  
 
** TAPE 1/CD-R/MD, TAPE 2 MONITOR  
  
  
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'''Technische Daten'''
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'''Specifications'''
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* Dauerleistung (bei Klirrfaktor)
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* Continuous power (at distortion)
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** 8 Ohm: 2x 95 W (0,003%)
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** 8 Ohm: 2x 95 W / 0,003%
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** 8 Ohm: 2x 100 W (1,0%, DIN)
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** 4 Ohm: 2x 140 W  
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** 4 Ohm: 2x 140 W (0,05%)
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2 Ohm: 2x 200 W
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** 4 Ohm: 2x 150 W (1,0%, DIN)
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* Dynamic power
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* Dynamikleistung
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** 8 Ohm: 2x 150 W
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** 8 Ohm:
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** 4 Ohm: 2x 200 W
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** 4 Ohm:  
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** 2 Ohm: 2x 300 W
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* Gesamtklirrfaktor: 0,003% (20Hz - 20 kHz, 95W, 8 Ohm)
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* Total harmonic distortion: 0.003% (20Hz - 20 kHz, 95W, 8 Ohm)
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* Frequenzgang:  
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* Frequency response: 5 Hz - 70 kHz
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* Stereokanaltrennung:
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* Stereo channel separation:
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* Signalrauschabstand:
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* Signal-to-noise ratio: 108 dB
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* Dämpfungsfaktor: 200
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* Attenuation factor: 200
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* Klangregelung: analog
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* Tone control: analog
 
** Bass: ±8 dB (100 Hz)
 
** Bass: ±8 dB (100 Hz)
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** Höhen: ±8 dB (10 kHz)  
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** Treble: ±8 dB (10 kHz)  
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* Loudness: ja, Taste
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* Loudness: yes, button
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* Subsonic: ja
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* Subsonic: yes, button
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* Mute: ja
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* Mute: yes
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* Direct/Line-Straight: ja
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* Direct/Line-Straight: yes
 
          
 
          
  
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'''Besondere Ausstattungen'''
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'''Special Features'''
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* Aufnahmewahlschalter
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* Record selector switch
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* Lautsprecherpaare und Kopfhörer werden über Relais geschaltet
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* Speaker pairs and headphones are switched via relays
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* Metallfrontplatte
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* Metal front panel
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* Direct - Schalter zum Überbrücken der Klangregelstufe
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* Direct - switch to bypass the tone control stage
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* Phono - Eingang mit Wahlmöglichkeit MM/MM subsonic Filter/MC/MC subsonic Filter
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* Phono - input with choice of MM/MM subsonic filter/MC/MC subsonic filter
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* switchable phono preamplifier
 +
* Separable pre- and power amplifier
 +
* connections for 2 speaker pairs A+B
 +
* shortened signal paths for the cleanest sound imaginable
 +
* spatially separated stages: Reduced interference
 +
* resonance-damping design: honeycomb-reinforced frame, heat sink and dampers to eliminate microphonic effects
 +
* powerful, low-impedance power supply: 2 power transformers and finned solid cast enclosure ensure high capacitance
 +
* good resonance damping and clean magnetic shielding
 +
* "Non-Switching" Type III: elimination of switching distortion and improved stability at low impedances
 +
* phono equalizer (can be switched off) with high gain; suitable for MM and MC systems
  
  
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==Bemerkungen==
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==Notes==
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Weitere Modelle der gleichen Serie
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* Previous model:
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* Pioneer A-656
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* [[Pioneer A-717 MK II]]
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* Pioneer A-757 MK II
 
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* Pioneer A-717
 
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* Pioneer A-777
 
  
  
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Pioneer hatte seinerzeit ausgehend vom A-717 eine ganze Reihe von Verstärkern derselben Grundkonzeption aufgelegt: Massive Bauweise mit durchweg überdimensionierten Bauteilen, was sich im Gewicht niederschlug. Die Haltbarkeit ist enorm, so dass die meisten heute noch gebraucht erhältlichen Verstärker absolut einwandfrei funktionieren. Insbesondere das typische Kratzen alter Schalter und Potis ist hier eher selten. Ab 7x7 haben die Verstärker zwei Trafos im Netzteil. Diese dienen jedoch nicht wie üblich der getrennten Versorgung der beiden Stereokanäle, sondern stellen die positive und die negative Betriebsspannung der Endstufen bereit.
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* Successor model:
 +
* [[Pioneer A-757 MK II]]
  
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Obwohl die Verstärker auf der Rückseite zwei Anschlusspaare aufweisen, die durch je eine Drahtbrücke verbunden sind, haben sie keine auftrennbaren Vor- und Endstufen. Dieser sogenannte Adapteranschluss befindet sich vielmehr vor Lautstärkeregler und Klangregelstufe. Deshalb kann man zwar die Pioneer-Verstärker als Endstufen für andere Vorstufen verwenden, nicht jedoch die Pioneer - Vorstufen mit anderen Endstufen verbinden.
 
  
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Der Klang dieser Verstärker ist im Vergleich zu ähnlichen Verstärkern anderer Hersteller als warm, kraftvoll und präzise zu bezeichnen, wobei vielleicht das letzte Quentchen Präzision gegenüber mehrfach teureren Geräten fehlt. Den Geräten ist ein ausgezeichnetes Preis - Leistungs - Verhältnis zu bescheinigen, insbesondere bei den heute gebraucht erhältlichen, welche sich technisch durchweg im Neuzustand befinden.
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* Other models in the same series:
 +
*[[Pioneer A-225]]
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*[[Pioneer A-335]]
 +
*[[Pioneer A-445]]
 +
*[[Pioneer A-656]]
 +
*[[Pioneer A-757]]
 +
*[[Pioneer A-858]]
  
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Die Verstärker der Serie A-656 bis A-757, evtl. auch spätere Modelle, haben lediglich eine echte Schwachstelle: Ein Kondensator in der Schutz- und Einschaltverzögerungsschaltung geht kaputt, worauf die Lautsprecherrelais verzögert einschalten und dann noch eine Weile schwirren. Die Reparatur dürfte im Fachbetrieb ca. 50 € kosten, plus 80 Cent Materialkosten.
 
  
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== Pictures ==
 +
*[[Image: Pioneer A-757
 +
[[Image:HPIM0855kl.JPG|Interior view]]
  
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== Bilder ==
 
  
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== Berichte ==
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* Image: Pioneer A-757
 +
[[File:Pioneer A-757.jpg]]
 +
 
 +
 
 +
* Image: Pioneer A-757
 +
[[File:Pioneer A-757 back.jpg]]
 +
 
 +
 
 +
== Reviews ==
 +
* Pioneer had at that time, based on the A-717, a whole series of amplifiers of the same basic concept: Massive construction with oversized components throughout, which was reflected in the weight. The durability is enormous, so that most amplifiers still available used today work absolutely flawlessly. Especially the typical scratching of old switches and pots is rather rare. From 7x7 the amplifiers have two transformers in the power supply. However, these do not serve as usual for the separate supply of the two stereo channels, but provide the positive and the negative operating voltage of the power amplifiers.
 +
 
 +
* Although the amplifiers have two pairs of connections on the rear panel, each connected by a wire jumper, they do not have pre and power stages that can be separated. Rather, this so-called adapter connection is located before the volume control and tone control stage. Therefore, although the Pioneer amplifiers can be used as power amplifiers for other preamplifiers, it is not possible to connect the Pioneer preamplifiers to other power amplifiers.
 +
 
 +
* The sound of these amplifiers can be described as warm, powerful and precise compared to similar amplifiers from other manufacturers, although perhaps the last bit of precision is missing compared to several times more expensive devices. The devices have an excellent price-performance ratio, especially the used ones, which are technically in new condition.
 +
 
 +
The amplifiers of the A-656 to A-757 series, possibly also later models, have only one real weak point: a capacitor in the protection and switch-on delay circuit is broken, whereupon the loudspeaker relays switch on delayed and then buzz for a while. The repair should cost about 50 € in a specialist shop, plus 80 cents material costs.
 +
 
  
 
== Links ==
 
== Links ==
  
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[[Kategorie:Vollverstärker]]
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 +
[[Category:Integrated amplifier]]

Latest revision as of 00:46, 8 April 2021

Short description[edit]

Still with copper chassis and horizontal PCB section. The only noticeable difference to the Pioneer A-717 MKII: Smaller knobs now made of aluminium instead of plastic.

Data[edit]

General

  • Manufacturer: Pioneer
  • Model: A-757
  • Type: Integrated amplifier
  • Years of manufacture: 1989 - 1990
  • Made in: Japan
  • Color: Black
  • Remote control: No
  • Power consumption: 820 W (max)
  • Dimensions: 420 x 435 x 162 mm (WxDxH)
  • Weight: 19,5 kg
  • Original price approx.: 1'000 DM


Connections

  • Number of inputs: 8
    • DAT /TAPE 1, TAPE 2, ADAPTER1/ TAPE3, ADAPTER 2, CD (gold plated), TUNER, LINE, PHONO (gold plated)
  • Number of outputs: 2
    • TAPE 1/CD-R/MD, TAPE 2 MONITOR


Specifications

  • Continuous power (at distortion)
    • 8 Ohm: 2x 95 W / 0,003%
    • 4 Ohm: 2x 140 W

2 Ohm: 2x 200 W

  • Dynamic power
    • 8 Ohm: 2x 150 W
    • 4 Ohm: 2x 200 W
    • 2 Ohm: 2x 300 W
  • Total harmonic distortion: 0.003% (20Hz - 20 kHz, 95W, 8 Ohm)
  • Frequency response: 5 Hz - 70 kHz
  • Stereo channel separation:
  • Signal-to-noise ratio: 108 dB
  • Attenuation factor: 200
  • Tone control: analog
    • Bass: ±8 dB (100 Hz)
    • Treble: ±8 dB (10 kHz)
  • Loudness: yes, button
  • Subsonic: yes, button
  • Mute: yes
  • Direct/Line-Straight: yes


Special Features

  • Record selector switch
  • Speaker pairs and headphones are switched via relays
  • Metal front panel
  • Direct - switch to bypass the tone control stage
  • Phono - input with choice of MM/MM subsonic filter/MC/MC subsonic filter
  • switchable phono preamplifier
  • Separable pre- and power amplifier
  • connections for 2 speaker pairs A+B
  • shortened signal paths for the cleanest sound imaginable
  • spatially separated stages: Reduced interference
  • resonance-damping design: honeycomb-reinforced frame, heat sink and dampers to eliminate microphonic effects
  • powerful, low-impedance power supply: 2 power transformers and finned solid cast enclosure ensure high capacitance
  • good resonance damping and clean magnetic shielding
  • "Non-Switching" Type III: elimination of switching distortion and improved stability at low impedances
  • phono equalizer (can be switched off) with high gain; suitable for MM and MC systems


Notes[edit]




Pictures[edit]

  • [[Image: Pioneer A-757

Interior view


  • Image: Pioneer A-757

Pioneer A-757.jpg


  • Image: Pioneer A-757

Pioneer A-757 back.jpg


Reviews[edit]

  • Pioneer had at that time, based on the A-717, a whole series of amplifiers of the same basic concept: Massive construction with oversized components throughout, which was reflected in the weight. The durability is enormous, so that most amplifiers still available used today work absolutely flawlessly. Especially the typical scratching of old switches and pots is rather rare. From 7x7 the amplifiers have two transformers in the power supply. However, these do not serve as usual for the separate supply of the two stereo channels, but provide the positive and the negative operating voltage of the power amplifiers.
  • Although the amplifiers have two pairs of connections on the rear panel, each connected by a wire jumper, they do not have pre and power stages that can be separated. Rather, this so-called adapter connection is located before the volume control and tone control stage. Therefore, although the Pioneer amplifiers can be used as power amplifiers for other preamplifiers, it is not possible to connect the Pioneer preamplifiers to other power amplifiers.
  • The sound of these amplifiers can be described as warm, powerful and precise compared to similar amplifiers from other manufacturers, although perhaps the last bit of precision is missing compared to several times more expensive devices. The devices have an excellent price-performance ratio, especially the used ones, which are technically in new condition.

The amplifiers of the A-656 to A-757 series, possibly also later models, have only one real weak point: a capacitor in the protection and switch-on delay circuit is broken, whereupon the loudspeaker relays switch on delayed and then buzz for a while. The repair should cost about 50 € in a specialist shop, plus 80 cents material costs.


Links[edit]

Retrieved from "https://hifi-wiki.com/index.php?title=Pioneer_A-757&oldid=276017"