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| | __NOTOC__ | | __NOTOC__ |
| − | == Data == | + | == Daten == |
| − | {{navigation}} | + | {{Navigation}} |
| − | '''General''' | + | '''Allgemein''' |
| − | * Manufacturer: [[Denon]] | + | * Hersteller: [[Denon]] |
| − | * Model: '''PMA-250'''' | + | * Modell: '''PMA-250''' |
| − | * Year of manufacture: 1987 | + | * Baujahre: 1987 - ?? |
| − | * Made in: Japan | + | * Hergestellt in: Japan |
| − | * Color: Black, Silver,Copper | + | * Farbe: Schwarz, Silber |
| − | * Type: Analog | + | * Typ: Analog |
| − | * Remote control: No | + | * Fernbedienung: Nein |
| − | * Power consumption: 80 W | + | * Leistungsaufnahme: 80 W |
| − | * Dimensions: 435 x 85 x 250 mm (WxHxD) | + | * Abmessungen: 435 x 85 x 250 mm (BxHxT) |
| − | * Weight: 4.7 kg | + | * Gewicht: 4,7 kg |
| − | * Original price approx.: 349-399,- DM | + | * Neupreis ca.: 349-399,- DM |
| − | * Model variants:
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| − | ** E2 Europe
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| − | ** EK UK
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| − | ** EI Asia
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| − | ** EU USA
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| − | ** EC Canada
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| − | ** EA Australia
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| | | | |
| | | | |
| − | '''Ports''' | + | '''Anschlüsse''' |
| − | * Number of inputs: | + | * Anzahl der Eingänge: |
| − | ** Phono (2.5mV 47kOhm) (RIAA MM). | + | ** Phono |
| − | CD/CD direct (150mV 47kOhm) | + | ** CD/CD-Direkt |
| − | ** Tuner (150mV 47kOhm) | + | ** Tuner |
| − | Aux (150mV 47kOhm) | + | ** Aux |
| − | ** Tape IN (150mV 47kOhm). | + | ** Tape IN |
| − | * Number of outputs: | + | * Anzahl der Ausgänge: |
| − | ** 1 speaker pair 4..16 Ohm | + | ** 1 Lautsprecherpaar 4..16 Ohm |
| − | ** Headphones 6,3mm jack
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| | ** Tape Record-Out | | ** Tape Record-Out |
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| | | | |
| − | '''Technical Data''' | + | '''Technische Daten''' |
| − | * Continuous power | + | * Dauerleistung (bei Klirrfaktor) |
| − | ** 8 Ohm: 2x 25 W (1kHz THD 1%) | + | ** 8 Ohm: 2x 30 W |
| − | ** 4 Ohm: 2x 40 W (1kHz THD 1%) | + | ** 4 Ohm: 2x 40 W |
| − | * Dynamic power | + | * Dynamikleistung |
| − | ** 8 Ohm: n.a. | + | ** 8 Ohm: |
| − | ** 4 Ohm: n.a. | + | ** 4 Ohm: |
| − | * Total harmonic distortion: 0.05% (-3dB rated Output, 8 Ohm) | + | * Gesamtklirrfaktor: 0,05% |
| − | * Attenuation factor: n.a. | + | * Dämpfungsfaktor: |
| − | * Frequency response: 10 ... 40,000 Hz | + | * Frequenzgang: 20-20000 Hz |
| − | * Signal to noise ratio: 72 dB, 96 dB | + | * Signalrauschabstand: 72 dB, 96 dB |
| − | * Stereo channel separation: n.a. | + | * Stereokanaltrennung: |
| − | * Tone control: | + | * Klangregelung: |
| | ** Bass: 100 Hz ± 10 dB | | ** Bass: 100 Hz ± 10 dB |
| − | Treble: 10 kHz ± 10 dB
| + | ** Höhen: 10 kHz ± 10 dB |
| − | Loudness: no | + | ** Loudness: nein |
| − | ** High Filter: no | + | ** High Filter: nein |
| − | ** Low Filter (Subsonic): no | + | ** Low Filter (Subsonic): nein |
| − | ** Mute: no | + | ** Mute: nein |
| − | ** Direct/Line-Straight: no | + | ** Direct/Line-Straight: nein |
| | | | |
| | | | |
| − | '''Special Features''' | + | '''Besondere Ausstattungen''' |
| − | * Balance control via double volume control on one axis | + | ** Balance-Regler auf/vor dem Volumeregler |
| − | * red LED signals that the unit is switched on | + | ** rote LED signalisiert den eingeschalteten Gerätezustand |
| − | * switch for tape monitor; tape playback is not provided via the source selector switch | + | ** Schalter für Tape-Monitor |
| − | * switch for CD-Direct, bypasses only the source switch and the tape monitor switch, but in principle passes through the tone control, | + | ** Schalter für CD-Direct, geht aber durch Klangregelung |
| − | * Headphones switch off main speakers when plugged in; except U.K. model. | + | ** Kopfhörerausgang 6,3mm-Stereoklinke; schaltet beim Einstecken die Hauptlautsprecher ab |
| − | * Model variants USA, Canada and Asia have additional power connections | |
| − | * Speaker clicks when switched off regardless of volume setting
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| | | | |
| | + | == Bemerkungen == |
| | + | Weitere Modelle der gleichen Serie: |
| | | | |
| − | '''Electronics'''
| + | == Bilder == |
| − | * Amplifier
| + | [[Datei:Denon PMA 250 000.jpg]] |
| − | ** discrete push-pull output stage with bipolar transistor pair 2SC3853/2SA1489 (conceivable European replacement types: TIP3055/TIP2955, TIP140/TIP145 (Darlington))
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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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| − | Adjustment of quiescent current setting rudimentary possible, exact adjustment requires disassembly down to PCB solder side
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| − | ** uPC1225H driver module
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| − | phono stage with OP M521BP
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| − | ** Tone control in feedback path between output power stage and input driver stage
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| − | ** Headphones connected via series resistor to output stage
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| − | * Power supply:
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| − | ** 2x 27VAC nominal voltage (center tap) ; 2x 32VAC idle.
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| − | 1x bridge rectifier (MB2U)
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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'.
| + | == 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 == | |
| − | [[File:Denon PMA 250 000.jpg]]
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| − | | |
| − | == Reports ==
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| | == Links == | | == Links == |
| | | | |
| − | [[Category:Integrated amplifier]] | + | [[Kategorie:Vollverstärker]] |