Marantz - 4270 - Receiver
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4270
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Your Marantz Model 4270 is a high-quality Stereo 2 +
Quadradial 4 Receiver developed by Marantz, a name famous
for quality in the audio component industry. The Model 4270
incorporates Marantz' exclusive Vari-Matrix circuit which
simulates 4-channel sound from normal 2-channel stereo
programs, and is capable of reproducing 4-channel sound from
any matrix-encoded source. The 4270 will also reproduce any
discrete 4- channel program as well as regular stereo and
monaural programs. An optional plug-in decoder adapts the
4270 for any specific matrix system such as Columbia's SQ.
The FM tuner section employs an FET for the RF amp and Mixer
stage. The IF tuning circuit employs ceramic filters of wide
bandwidth and high selectivity to provide high sensitivity
and unparalleled interference-free operation. The 4270
incorporates a switchable 2-channel DOLBY system to reduce
noise, inherent in recording music from records, tape, FM
broadcasts and TV.
The FM multiplex circuitry includes a phase locked loop
Stereo-Monaural Automatic switching circuit, stereo
indicator circuit and a buffer amplifier to obtain output at
low impedance. Low pass filters for 19KHz and 3SKHz
rejection are incorporated. Moreover, the Model 4270 unit
has a muting circuit that permits pleasant FM broadcast
reception by completely eliminating inter-station
interference which is usually generated at the time of
selecting FM stations.
TECHNICAL SPECIFICATIONS
FM SECTION:
Tuning Frequency
Range...............................................................................................
88 — 108 MHz
IHFM Usable
Sensitivity..............................................................................................................23μ/
I HF
Selectivity...............................................................................................................................60
dB
Capture
Ratio...............................................................................................................................1.6
dB
Image Rejection Ratio at 106
MHz............................................................................................70
dB
Signal to Noise Ratio (Mono)
.....................................................................................................70
dB
Signal to Noise Ratio (Stereo)
...................................................................................................60
dB
Total Harmonic Distortion
(Mono)...............................................................................................0.2%
Total Harmonic Distortion
(Stereo)...............................................................................................0.3%
Frequency Response (ref. 75μ sec.
de-emphasis)........................................30 Hz to
15 KHz, ± 1 dB
Stereo Separationat 1
KHz..........................................................................................................40
dB
Quadradial Output (400 Hz 75 KHz
dev.)...............................................................................300mV
AM SECTION:
Tuning Frequency
Range..........................................................................................
540 — 1605 KHz
Usable Sensitivity
.........................................................................................................................
30μν
Selectivity.....................................................................................................................................26
dB
Image Rejection Ratio at 1400
KHz..........................................................................................70
dB
Signal to Noise Ratio
..................................................................................................................45
dB
Frequency Response (—6 dB)
.................................................................................50
Hz to 3.5 KHz
Total Harmonic Distortion
................................................................................................................1%
AUDIO SECTION:
Input Impedance — Low level
input......................................................................Phono
47K ohms
— High level
input.................................................................................100K
ohms
I nput Sensitivity —
Phono.............................................................................2.2mV
for 25W output
— High
level.........................................................................150mV
for 25W output
Frequency Response
...........................................................................+1.0
dB, 20 Hz to 20 KHz at
1W output
Intermodulation
Distortion...........................................................................
Less than 0.3% at rated
power output
Total Harmonic Distortion
.............................................................................Less
than 0.3% at rated
power output
Damping Factor
............................................................................................More
than 45 at 8 ohms
Total Noise — From magnetic phono
input............................................Less than
2μ/ equivalent
to power amp output input noise at 8 ohms rated
power output
Volume
Tracking...........................................................................................................
Less than 4 dB
Rated Continuous (RMS)
Output...............................................................................25Wat8ohms
all channels operating simultaneously at 40 Hz to 25W at 4
ohms 20 KHz for nominal harmonic distortion 13W at 16 ohms
Comparable Total Music
Power.................................................................................150W
at 8 ohms
GENERAL:
Power Requirements
120 V
Power Consumption — at rated power output, all
channels.................................................. 400W
— idling (no
signal).................................................................................45W
Dimensions — Panel
Width...................................................................................17-21/64
Inches
— Panel
Height...................................................................................
5-25/64 Inches
— Depth
................................................................................................14-3/8
Inches
— Width (Packed for
Shipment)............................................................22-1/4
Inches
— Height (Packed for
Shipment)..........................................................10-1/2
Inches
— Depth (Packed for
Shipment)..........................................................19-1/2
Inches
Weight — Unit
alone..........................................................................................................40.2
lbs
— Packed for
Shipment..........................................................................................
49.1 lbs
2 Manuals
Service manual
Manual type:
Service manual
Pages:
49
Size:
13.9 MB
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
March 8, 2015
MD5:
196c326b-011d-8307-df74-be8ec67d1b93
Downloads:
900
User manual
Manual type:
User manual
Pages:
24
Size:
13.1 MB
Language:
english
Revision:
Manual-ID:
288985101-0
Date:
Quality:
Scanned document, all readable.
Upload date:
April 26, 2015
MD5:
45464449-36fd-89b1-b749-cc2e1107adf3
Downloads:
640