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Marantz Model 2285b Receiver

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Front View
Image Attribution: My own unit, from it's Ebay auction. Now sold.


Rear View
EBay Auction #1208014344
Date: January 14th, 2001

General
RarityScarce
Retail Price670
Ebay Low-bid$150.00
Designed inUSA
Manufactured InJapan
First Year1977
Last Year1980
Wood CaseWC-122
Silver FaceYes
ChannelsTwo
Speaker ConnectionsMain, Remote
Chassis GroundKnurled screw
AC SwitchYes
FusingRear deck, buss, 5 ampere
Switched AC OutletsOne @ 100 watts
Unswitched AC OutletsOne @ 200 watts
Power Source DetailsDual Secondary power supply
Power Consumption340 watts, 50 watts @ idle
Independent Power SuppliesDual Secondary only
Special Option 1DLB1 Dolby FM Decoder (US Models only)

Valuation, Purchases, Parts and Manuals

Physical
Panel Width5 3/8
Panel Height17 5/16
Width17 1/4
Height5 1/2
Depth14 1/4
Weight37.4 lbs, 42.9 packed for shipment

Amplifier
RMS Power Per Channel85x2
Damping Factor @ Load Impedance60 (at 20 Hz)
Total Harmonic Distortion (THD)0.05%
Power Bandwidth20 hz to 20 khz
Frequency Response+/- 0.2 dB 20 Hz to 20 KHz @ 1 watt
Intermodulation Distortion (IM)0.05% @ 8 ohms, 0.10% @ 4 ohms
Input Impedance33 Kohm
Input Sensitivity for Full Output1.5 Volts
Output Impedance(s)8 ohms to 4 ohms

FM Tuner
Gyro TuningYes
RF Sensitivity1.8 uV
300 Ohm Binding PostsYes
75 Ohm Binding PostsYes
75 Ohm F ConnectorYes
50 dB quieting sensitivity, Stereo35 uV
50 dB quieting sensitivity, Mono3.0 uV
Ultimate Quieting78 dB @ 1000 uV
THD, Mono0.30%
THD, Stereo0.50%
Frequency Response30 Hz to 15 KHz +/- 1.5 dB in Stereo
Hum and Noise75 dB
Capture Ratio1.0 dB at 65 dBf
IF Image Rejection90 dB
IF Rejection100 dB
Stereo Subcarrier Rejection70 dB
Alternate Channel Selectivity (wide or normal)080 dB
Spurious Rejection100 dB
AM Carrier Rejection55 dB
Stereo Separation at 1 kHz50 dB
Mono SwitchYes
Signal Strength MeterYes
Center Tuning MeterYes
Multiplex Filter (Hi-Blend)Yes
Stereo LampYes
FM Mode LampYes
Multipath ListenYes
Muting SwitchYes
Muting AdjustmentRear Deck
25 uS Deemphasis Switch (Dolby Associated)Yes
Dolby Fm Decoding OptionYes
Illuminated Dial PointerYes

AM Tuner
Alternate Channel Selectivity46 dB
IF Rejection75 dB
Image Rejection75 dB
THD0.4%
Signal to Noise Ratio54 dB
Spurious Response Rejection85 dB
Signal Strength MeteringYes

Preamplifier
Multiple Bass AdjustmentsYes
Multiple Midrange AdjustmentsYes
Multiple Treble AdjustmentsYes
Tone Control DefeatYes
Bass Turnover OptionsYes
Treble Turnover OptionsYes
High FilterYes
Low FilterYes
Gain ControlYes
Loudness ContourYes
MonoL, R, L+R (discrete buttons)
BalanceKnob
Number of Tape MonitorsTwo
Tape to Tape DubbingVia front panel or rear, 1 to 2 or 2 to 1
Auxillary Input SourceYes
Phono Input SourceYes
2nd Phono Input SourceYes
Illuminated Source IndicatorsYes
Tuner Source InputAm/FM
Tape MonitorYes
2nd Tape monitorYes
Preamp to Amplifier Jumper(s)Yes
Headphone Jack(s)Yes
Speaker Selection Nomenclature1, 2

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