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Forsterker/radio. Vintage 1974 Pioneer Model QX-949 Quadraphonic (4-kanals) lyd
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Chat GPT: Pioneer QX-949 er en vintage stereoforsterker med quadraphonic (4-kanals) lyd, Det var en populær modell fra Pioneer på 1970-tallet. Denne modellen var kjent for sin kraftige ytelse og omfattende funksjoner for sin tid.
Egen presentasjon:
Svært sjelden, kun én eier (familie også sjeldent) siden 1974, med spesiell norsk musikkhistorie som bakteppe. De selges, men absolutt ikke for en hver pris. Jeg overtok denne fra min far i 1984. Ikke brukt frem til 1996, da jeg testet den (knirket litt da jeg vred på volumknappen). Pakket den ned igjen pga. størrelsen (jeg var ferdig med min hi-fi-periode). Siden har den stått i kjeller og på lager frem til april 2024. I disse dager er den 50 år. Det måtte feires. Den ble langsomt kjørt i gang ved bruk av en transformator/vario, ti og ti volt pr. 10 minutter, slik at ikke transistorer og annet skulle få sjokk. Ved 160 Volt begynte den å lyse av pur glede, og ved 230 Volt startet jeg prøvespillingen. Den virket (!) fra iPhone via Tape-inngangen, men om alt virker kan jeg ikke garantere. Det er bare noe jeg tror.
Her er noen omtaler jeg har funnet på Internett:
- The QX-949 is Pioneer's ultimate four channel FM/MW stereo receiver, featuring all present quadraphonic systems, CD-4, SQ and regular matrix.
- The unique power boosting circuit converts the large 4-channel power output to even greater 2-channel power.
- Other features include 3 pairs of tape terminals, 4 pairs of speaker systems, 2 pairs of phono terminals, high and low filters and a Dolby NR adapter switch.
• IIRC 70wpc in stereo.
I think people have trouble enough with stereo and don't get the fact that many quads can run in a stereo mode with good power.
• They have 3 speaker output. In quad you can hook up 12 speakers! You can run 8 at a time!
Might have dual TT inputs.
• Quadraphonic gear as a whole is under rated.
They were the peak Pioneer quad,TOTL.
The only drawback to quad gear is its weight. Twice as much stuff inside, and that is the other draw back, they are a bear to work on.
• They are fantastic!
Way under the radar!
Spesifikasjoner (fra Internet)
Tuning range: FM, MW
Power output: 60W/ch (stereo), 40W/ch into 8Ω (quadraphonic)
Frequency response: 7Hz to 25kHz
Total harmonic distortion: 0.3%
Damping factor: 35
Input sensitivity: 2.5mV (MM), 150mV (line)
Signal to noise ratio: 70dB (MM), 90dB (line)
Output: 150mV (line)
Speaker load impedance: 4Ω to 16Ω
Semiconductors: 14 x FET, 7 x IC, 118 x transistors, 69 x diodes
Dimensions: 550 x 160 x 440mm
Weight: 22.4kg
Year: 1974
Manufacturer: Pioneer
Model: QX-949
Type: Quadraphonic Receiver
Years of manufacture: 1973 - 1976
Made in: Japan
Color: silver, wooden case walnut
Power consumption: 530 watts
Dimensions: 550 x 160 x 440 mm
Weight: 22,4 Kg
Original price approx.: 750 US-$, 3'752 DM
Connections:
Number of inputs:
Phono: 2.2 mV, 50 kOhm.
Phono ground connection: yes
AUX: 140 mV, 100 kOhm
Tape: 140 mV, 100 kOhm
Coaxial FM- antenna connection (75 Ohm)
AM antenna connection (300 Ohm)
Number of outputs:
3 x loudspeaker pairs: 2 x front, 1 x rear
2 x headphone output front + rear: 6.3 mm jack each
Technical data:
Amplifier:
continuous power: quadrophonic, 20-20 kHz
8 Ohm: 4 x 40 Watt
4 Ohm: 4 x 44 Watt
music power: quadrophonic, 20-20 kHz
8 Ohm: 4 x 58 Watt
4 Ohm: 4 x 75 Watt
Continuous power: Stereo, 20- 20 kHz
8 Ohm: 2 x 60 Watt
4 Ohm: 2 x 65 Watt
Continuous power: Stereo, 1 kHz
8 Ohm: 85 Watt
4 Ohm: 100 Watt
Total harmonic distortion: 0.3 % at 20- 20'000 Hz, 0.02 % at 1 Watt, 8 Ohm
Attenuation factor: 35 at 8 ohms, 1 kHz
Frequency response:
AUX, Tape: 10 - 25'000 Hz + 0,5 dB, - 1 dB
Phono: 30 - 15'000 Hz ± 1 dB
Power bandwidth: 7 - 40'000 Hz
Signal-to-noise ratio:
Phono: 70 dB
Line: 90 dB
Tone control: yes
Bass: ± 10 dB, 100 Hz
treble: ± 10 dB, 10 kHz
Loudness: yes
High Filter: no
Low Filter (Subsonic): no
CD-4 demodulator part:
Input sensitivity: 2.5 mV
Input impedance: 100 kOhm
Distortion factor: 0,07
Signal-to-noise ratio: > 70 dB
Channel separation at 1 kHz:
Left to Right: 50 dB
front to rear: 30 dB
Frequency range: 20 - 15'000 Hz
Tuner:
Reception: FM, AM
Frequencies:
FM: 88 - 108 MHz
MW: 535 - 1600 kHz
Input sensitivity:
FM: 1.8 µV
MW: 15 µV
Frequency response: 20 - 15'000 Hz
Distortion factor FM: stereo 0.4 %, mono 0.2 %
Signal-to-noise ratio:
FM: 70 dB
AM: 50 dB
Stereo channel separation: > 40 dB at 1 kHz
Selectivity:
FM: 80 dB
AM: > 25 dB
Co-wave selection: 1.0 dB
Spurious wave selection: 65 dB
Image frequency attenuation:
FM: > 85 dB
MW: > 65 dB IF attenuation:
FM: > 90 dB
MW: > 85 dB
AM suppression: 65 dB
Special Features
Equipped with all quadraphonic systems:
CD-4
SQ Decoder
Regular Matrix
Quadro level meter
Connector for Dolby adapter
MPX 4-Channel Output Jack
MPX Noise Filter
FM Muting
Bass / Tweeter control V + H separate
Display level switchable: 0 dB, - 10 dB, - 20 dB
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Sist endret: 9.5.2024, 16:41 ・ FINN-kode: 352382272