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Power Amplifier Model 9

Power Amplifier Model 9; Marantz Sound United (ID = 1966638) Ampl/Mixer
 
Power Amplifier Model 9; Marantz Sound United (ID = 1966640) Ampl/Mixer
 
Power Amplifier Model 9; Marantz Sound United (ID = 1966642) Ampl/Mixer
 
Power Amplifier Model 9; Marantz Sound United (ID = 1966644) Ampl/Mixer
 
Power Amplifier Model 9; Marantz Sound United (ID = 1966645) Ampl/Mixer
Power Amplifier Model 9; Marantz Sound United (ID = 1382975) Ampl/Mixer Power Amplifier Model 9; Marantz Sound United (ID = 1382976) Ampl/Mixer
Power Amplifier Model 9; Marantz Sound United (ID = 1382977) Ampl/Mixer Power Amplifier Model 9; Marantz Sound United (ID = 1382978) Ampl/Mixer
Power Amplifier Model 9; Marantz Sound United (ID = 1382979) Ampl/Mixer Power Amplifier Model 9; Marantz Sound United (ID = 1382980) Ampl/Mixer
Power Amplifier Model 9; Marantz Sound United (ID = 1776739) Ampl/Mixer
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Power Amplifier Model 9; Marantz Sound United (ID = 1382975) Ampl/Mixer
Marantz Sound United: Power Amplifier Model 9 [Ampl/Mixer] ID = 1382975 640x360
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For model Power Amplifier Model 9, Marantz (Sound United LLC); Vista, CA:
aus ebay, #380438096428, Verkäufer myostuff
 
Country:  United States of America (USA)
Manufacturer / Brand:  Marantz (Sound United LLC); Vista, CA
Year: 1960–1968 Category: Audio Amplifier or -mixer
Valves / Tubes 7: 6DJ8 or ECC88 6DJ8 or ECC88 6CG7 6CA7 or EL34 6CA7 or EL34 6CA7 or EL34 6CA7 or EL34
Main principle Audio-Amplification
Wave bands - without
Details Hi-Fi equipment
Power type and voltage Alternating Current supply (AC) / 117 Volt
Loudspeaker - This model requires external speaker(s).
Power out 70 W (undistorted)
from Radiomuseum.org Model: Power Amplifier Model 9 - Marantz Sound United LLC;
Material Metal case
Shape Tablemodel, low profile (big size).
Dimensions (WHD) 15.375 x 8.25 x 10.5 inch / 391 x 210 x 267 mm
Notes

A massive hi-fi mono power amplifier with power output of 70 watts RMS into 8 ohms. A pair are required for stereo.

SPECIFICATION 
POWER70 watts continuous
140 watts peak
Switch for nearly 40 watt triode operation
RESPONSE 
 At full rated powerwithin 0.1dB, 20Hz-20kHz
within 1dB, 12Hz-40kHz
 At ½ wattwithin 1dB, 3Hz-40kHz
HARMONIC DISTORTION 
 At full rated powerless than 0.1% at mid-frequencies
less than 0.33% at 20Hz-20kHz
I.M. DISTORTIONless than 0.5% at full rated power
HUM & NOISEBetter than 90dB below 70 watts
DAMPING FACTOR17
Damping Factor can be changed
internally by adding current feedback
OUTPUT IMPEDANCES4Ω, 8Ω and 16Ω, plus 1Ω tap
for center-speaker connection

TEST SECTION
Complete built-in instrument for self-testing and balancing of output and driver tubes. Adjustments for balance of driving signal. The circuit includes five screwdriver adjustments, a seven-position test switch, and an accurately calibrated d'Arsonval meter. These simple adjustments eliminate the need for matched output tubes and assure optimum performance despite normal tube aging.

CONTROLS
All controls, adjustments and connections, with the exception of the Triode switch, are accessible from the front.
Gain Control: isolated by cathode-follower, phase circuit.
Phase Switch: for securing correct phase relation (A + B)  of phantom center-channel  speaker fed by two amplifiers.
Low Filter: Subsonic cutoff filter, less than 0.25dB at 20Hz, 20dB at 3Hz.
Test Switch: for bias (plate current) readings for each tube. Built-in test signal for dynamic balance adjustment.

Five bias and balance adjustments, as well as input and output connections, are located under snap-out access panel.

The Model 9R has rack fittings.

The Model 9 was reissued in 1996, one of the Marantz Classic Series.

Power requirements
117V (105-125V) 50/60Hz

Power consumption:  190-250 watts

Net weight (2.2 lb = 1 kg) 23 kg / 50 lb 10.6 oz (50.661 lb)
Price in first year of sale 324.00 $
Mentioned in -- Original prospect or advert (Marantz Model 9 Seventy Watt Amplifier brochure)
Literature/Schematics (1) - - Manufacturers Literature (Service manual Marantz 9 Power Amplifier)
Literature/Schematics (2) - - Manufacturers Literature (Instruction manual Marantz Model 9 Power Amplifier)

Model page created by Gottfried Silberhorn. See "Data change" for further contributors.



All listed radios etc. from Marantz (Sound United LLC); Vista, CA
Here you find 539 models, 530 with images and 84 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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