Latest revision |
Your text |
Line 1: |
Line 1: |
| __NOTOC__ | | __NOTOC__ |
− | == Data == | + | == Daten == |
− | {{navigation}} | + | {{Navigation}} |
− | '''General''' | + | '''Allgemein''' |
− | * Manufacturer: [[Denon]] | + | * Hersteller: [[Denon]] |
− | * Model: '''PMA-250'''' | + | * Modell: PMA-250 |
− | * Year of manufacture: 1987 | + | * Baujahre: |
− | * 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: |
− | * Original price approx.: 349-399,- DM | + | * Neupreis ca.: |
− | * Model variants:
| |
− | ** E2 Europe
| |
− | ** EK UK
| |
− | ** EI Asia
| |
− | ** EU USA
| |
− | ** EC Canada
| |
− | ** EA Australia
| |
| | | |
| | | |
− | '''Ports''' | + | '''Anschlüsse''' |
− | * Number of inputs: | + | * Anzahl der Eingänge: |
− | ** Phono (2.5mV 47kOhm) (RIAA MM). | + | ** hier die Eingänge aufzählen (mit Empfindlichkeit/Impedanz) |
− | CD/CD direct (150mV 47kOhm)
| + | * Anzahl der Ausgänge: |
− | ** Tuner (150mV 47kOhm) | + | ** hier die Ausgänge aufzählen (mit Pegel/Impedanz) |
− | 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''' | + | '''Technische Daten''' |
− | * Continuous power | + | * Dauerleistung (bei Klirrfaktor) |
− | ** 8 Ohm: 2x 25 W (1kHz THD 1%) | + | ** 8 Ohm: |
− | ** 4 Ohm: 2x 40 W (1kHz THD 1%) | + | ** 4 Ohm: |
− | * 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: |
− | * Attenuation factor: n.a. | + | * Dämpfungsfaktor: |
− | * Frequency response: 10 ... 40,000 Hz | + | * Frequenzgang: |
− | * Signal to noise ratio: 72 dB, 96 dB | + | * Signalrauschabstand: |
− | * Stereo channel separation: n.a. | + | * Stereokanaltrennung: |
− | * Tone control: | + | * Klangregelung: |
− | ** Bass: 100 Hz ± 10 dB | + | ** Bass: |
− | Treble: 10 kHz ± 10 dB
| + | ** Höhen: |
− | Loudness: no | + | * Loudness: |
− | ** High Filter: no
| + | * High Filter: |
− | ** Low Filter (Subsonic): no
| + | * Low Filter (Subsonic): |
− | ** Mute: no
| + | * Mute: |
− | ** Direct/Line-Straight: no
| + | * Direct/Line-Straight: |
| | | |
| | | |
− | '''Special Features''' | + | '''Besondere Ausstattungen''' |
− | * Balance control via double volume control on one axis | + | * hier, wenn vorhanden |
− | * 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'''
| + | == Bemerkungen == |
− | * Amplifier
| + | Weitere Modelle der gleichen Serie: |
− | ** 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'.
| + | == Bilder == |
| | | |
− | | + | == 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 == |
| | | |
− | [[Category:Integrated amplifier]] | + | [[Kategorie:Vollverstärker]] |