Editing Denon PMA-250

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__NOTOC__
 
__NOTOC__
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== Data ==
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== Daten ==
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{{navigation}}
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{{Navigation}}
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'''General'''
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'''Allgemein'''
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* Manufacturer: [[Denon]]
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* Hersteller: [[Denon]]
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* Model: '''PMA-250''''
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* Modell: '''PMA-250'''
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* Year of manufacture: 1987
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* Baujahre: 1987 - ??
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* Made in: Japan
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* Hergestellt in: Japan
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* Color: Black, Silver,Copper
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* Farbe: Schwarz, Silber
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* Type: Analog
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* Typ: Analog
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* Remote control: No
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* Fernbedienung: Nein
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* Power consumption: 80 W
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* Leistungsaufnahme: 80 W
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* Dimensions: 435 x 85 x 250 mm (WxHxD)
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* Abmessungen: 435 x 85 x 250 mm (BxHxT)
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* Weight: 4.7 kg
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* Gewicht: 4,7 kg
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* Original price approx.: 349-399,- DM
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* Neupreis ca.: 349-399,- DM
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* Model variants:
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* Modellvarianten:
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** E2 Europe
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** E2 Europa
 
** EK UK
 
** EK UK
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** EI Asia
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** E1 Asien
 
** EU USA
 
** EU USA
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** EC Canada
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** EC Kanada
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** EA Australia
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** EA Australien
  
  
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'''Ports'''
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'''Anschlüsse'''
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* Number of inputs:
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* Anzahl der Eingänge:
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** Phono (2.5mV 47kOhm) (RIAA MM).
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** Phono         (2,5mV 47kOhm) (RIAA MM)
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CD/CD direct (150mV 47kOhm)
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** CD/CD-Direkt  (150mV 47kOhm)
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** Tuner (150mV 47kOhm)
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** Tuner         (150mV 47kOhm)
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Aux (150mV 47kOhm)
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** Aux           (150mV 47kOhm)
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** Tape IN (150mV 47kOhm).
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** Tape IN       (150mV 47kOhm)
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* Number of outputs:
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* Anzahl der Ausgänge:
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** 1 speaker pair 4..16 Ohm
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** 1 Lautsprecherpaar 4..16 Ohm
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** Headphones 6,3mm jack
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** Kopfhörer 6,3mm Klinke
 
** Tape Record-Out
 
** Tape Record-Out
  
  
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'''Technical Data'''
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'''Technische Daten'''
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* Continuous power
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* Dauerleistung
 
** 8 Ohm: 2x 25 W (1kHz THD 1%)
 
** 8 Ohm: 2x 25 W (1kHz THD 1%)
 
** 4 Ohm: 2x 40 W (1kHz THD 1%)
 
** 4 Ohm: 2x 40 W (1kHz THD 1%)
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* Dynamic power
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* Dynamikleistung
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** 8 Ohm: n.a.
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** 8 Ohm: k.A.
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** 4 Ohm: n.a.
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** 4 Ohm: k.A.
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* Total harmonic distortion: 0.05% (-3dB rated Output, 8 Ohm)
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* Gesamtklirrfaktor: 0,05% (-3dB rated Output, 8 Ohm)
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* Attenuation factor: n.a.
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* Dämpfungsfaktor:
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* Frequency response: 10 ... 40,000 Hz
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* Frequenzgang: 10-40000 Hz
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* Signal to noise ratio: 72 dB, 96 dB
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* Signalrauschabstand: 72 dB, 96 dB
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* Stereo channel separation: n.a.
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* Stereokanaltrennung:
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* Tone control:
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* Klangregelung:
 
** Bass: 100 Hz ± 10 dB
 
** Bass: 100 Hz ± 10 dB
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Treble: 10 kHz ± 10 dB
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** Höhen: 10 kHz ± 10 dB
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Loudness: no
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** Loudness: nein
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** High Filter: no
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** High Filter: nein
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** Low Filter (Subsonic): no
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** Low Filter (Subsonic): nein
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** Mute: no
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** Mute: nein
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** Direct/Line-Straight: no
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** Direct/Line-Straight: nein
  
  
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'''Special Features'''
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'''Besondere Ausstattungen'''
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* Balance control via double volume control on one axis
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* Balance-Regler auf/vor dem Volumeregler
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* red LED signals that the unit is switched on
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* rote LED signalisiert den eingeschalteten Gerätezustand
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* switch for tape monitor; tape playback is not provided via the source selector switch
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* Schalter für Tape-Monitor
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* switch for CD-Direct, bypasses only the source switch and the tape monitor switch, but in principle passes through the tone control,
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* Schalter für CD-Direct, geht aber durch Klangregelung
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* Headphones switch off main speakers when plugged in; except U.K. model.
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* Kopfhörer schaltet beim Einstecken die Hauptlautsprecher ab, außer Model U.K.
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* Model variants USA, Canada and Asia have additional power connections
 
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* Speaker clicks when switched off regardless of volume setting
 
  
  
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'''Electronics'''
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'''Elektronik'''
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* Amplifier
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* Verstärker
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** discrete push-pull output stage with bipolar transistor pair 2SC3853/2SA1489 (conceivable European replacement types: TIP3055/TIP2955, TIP140/TIP145 (Darlington))
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** diskrete Gegentaktendstufe mit Transistorpaar 2SC3853/2SA1489
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** Fuse protection of the power amplifiers per channel by F4.0A fine-wire fuse on the motherboard
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** Anpassung der Ruhestromeinstellung rudimentär möglich
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Adjustment of quiescent current setting rudimentary possible, exact adjustment requires disassembly down to PCB solder side
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** Absicherung der Lautsprecher jeweils durch F4,0A-Sicherung auf der Hauptplatine
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** uPC1225H driver module
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** Treiberbaustein uPC1225H
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phono stage with OP M521BP
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** Phonostufe mit OP M521BP
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** Tone control in feedback path between output power stage and input driver stage
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* Netzteil:
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** Headphones connected via series resistor to output stage
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** 2x 32VAC Leerlauf (Mittenabgriff)
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* Power supply:
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** 1x Brückengleichrichter
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** 2x 27VAC nominal voltage (center tap) ; 2x 32VAC idle.
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** 2x 8200uF Siebung auf +35,9VDC / -36,0VDC -> Versorgung Endstufe
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1x bridge rectifier (MB2U)
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** 2x lineare Längsregelung auf +16,8VDC / -16,5VDC -> Versorgung Phono-Stufe
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** 2x 8200uF filtering to ±36VDC -> supply output stage
 
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** 2x linear longitudinal regulation to ±16,5VDC -> supply phono stage
 
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** protection of the power side by T1,0A fine-wire fuse inside the unit
 
  
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Circuit diagram can be found on the net under 'denon pma 250 service manual pdf'.
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== Bemerkungen ==
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Weitere Modelle der gleichen Serie:
  
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== Bilder ==
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[[Datei:Denon PMA 250 000.jpg]]
  
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== Berichte ==
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<big>Listening test on Wharfedale Diamond 220 from 22 May 2021 Klaushuhn
 
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Other equipment Bluesound Note 150
 
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I have selected my music pieces under Al Di Meola, AC DC and Pat Metheny.
 
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A mix that should reveal sonic strengths and weaknesses.
 
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With CD direct switching and without loudness, it quickly becomes apparent what the "little one" can do.
 
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can do.
 
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An excellent neutrality. The most surprising thing is the excellent
 
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spatial representation. Wide and deep. Never intrusive, yet present.
 
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Then there are the excellent large speaker terminals.
 
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to look at. For the reception of banana plugs. Clearly ahead of its class and time.
 
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An absolute buy recommendation for speakers with medium to high efficiency.
 
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</big>
 
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== Pictures ==
 
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[[File:Denon PMA 250 000.jpg]]
 
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== Reports ==
 
  
 
== Links ==
 
== Links ==
  
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[[Category:Integrated amplifier]]
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[[Kategorie:Vollverstärker]]

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