Difference between revisions of "Denon PMA-250"

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

Latest revision as of 03:34, 22 May 2021

Data[edit]

General

  • Manufacturer: Denon
  • Model: PMA-250'
  • Year of manufacture: 1987
  • Made in: Japan
  • Color: Black, Silver,Copper
  • Type: Analog
  • Remote control: No
  • Power consumption: 80 W
  • Dimensions: 435 x 85 x 250 mm (WxHxD)
  • Weight: 4.7 kg
  • Original price approx.: 349-399,- DM
  • Model variants:
    • E2 Europe
    • EK UK
    • EI Asia
    • EU USA
    • EC Canada
    • EA Australia


Ports

  • Number of inputs:
    • Phono (2.5mV 47kOhm) (RIAA MM).

CD/CD direct (150mV 47kOhm)

    • Tuner (150mV 47kOhm)

Aux (150mV 47kOhm)

    • Tape IN (150mV 47kOhm).
  • Number of outputs:
    • 1 speaker pair 4..16 Ohm
    • Headphones 6,3mm jack
    • Tape Record-Out


Technical Data

  • Continuous power
    • 8 Ohm: 2x 25 W (1kHz THD 1%)
    • 4 Ohm: 2x 40 W (1kHz THD 1%)
  • Dynamic power
    • 8 Ohm: n.a.
    • 4 Ohm: n.a.
  • Total harmonic distortion: 0.05% (-3dB rated Output, 8 Ohm)
  • Attenuation factor: n.a.
  • Frequency response: 10 ... 40,000 Hz
  • Signal to noise ratio: 72 dB, 96 dB
  • Stereo channel separation: n.a.
  • Tone control:
    • Bass: 100 Hz ± 10 dB

Treble: 10 kHz ± 10 dB Loudness: no

    • High Filter: no
    • Low Filter (Subsonic): no
    • Mute: no
    • Direct/Line-Straight: no


Special Features

  • Balance control via double volume control on one axis
  • red LED signals that the unit is switched on
  • switch for tape monitor; tape playback is not provided via the source selector switch
  • switch for CD-Direct, bypasses only the source switch and the tape monitor switch, but in principle passes through the tone control,
  • Headphones switch off main speakers when plugged in; except U.K. model.
  • Model variants USA, Canada and Asia have additional power connections
  • Speaker clicks when switched off regardless of volume setting


Electronics

  • Amplifier
    • discrete push-pull output stage with bipolar transistor pair 2SC3853/2SA1489 (conceivable European replacement types: TIP3055/TIP2955, TIP140/TIP145 (Darlington))
    • Fuse protection of the power amplifiers per channel by F4.0A fine-wire fuse on the motherboard

Adjustment of quiescent current setting rudimentary possible, exact adjustment requires disassembly down to PCB solder side

    • uPC1225H driver module

phono stage with OP M521BP

    • Tone control in feedback path between output power stage and input driver stage
    • Headphones connected via series resistor to output stage
  • Power supply:
    • 2x 27VAC nominal voltage (center tap) ; 2x 32VAC idle.

1x bridge rectifier (MB2U)

    • 2x 8200uF filtering to ±36VDC -> supply output stage
    • 2x linear longitudinal regulation to ±16,5VDC -> supply phono stage
    • protection of the power side by T1,0A fine-wire fuse inside the unit

Circuit diagram can be found on the net under 'denon pma 250 service manual pdf'.



Listening test on Wharfedale Diamond 220 from 22 May 2021 Klaushuhn

Other equipment Bluesound Note 150

I have selected my music pieces under Al Di Meola, AC DC and Pat Metheny. A mix that should reveal sonic strengths and weaknesses.

With CD direct switching and without loudness, it quickly becomes apparent what the "little one" can do. can do.

An excellent neutrality. The most surprising thing is the excellent spatial representation. Wide and deep. Never intrusive, yet present.

Then there are the excellent large speaker terminals. to look at. For the reception of banana plugs. Clearly ahead of its class and time.

An absolute buy recommendation for speakers with medium to high efficiency.

Pictures[edit]

Denon PMA 250 000.jpg

Reports[edit]

Links[edit]