What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





McIntosh MA-6200

 The MA 6200 is another fine expression of stereo engineering and craftsmanship by McIntosh. The flexibility and high performance found in the MA 6200 are a result of direct customer contact, continued market analysis and aggressive, advanced research. The McIntosh reputation for excellence in performance, flexibilty, quality and reliability comes from extensive testing leading to the careful selection of materials and circuit components combined with dedicated craftsmanship.
 MA 6200 Features
Seven Different Program Sources
The input switch selects from five different sources or you can choose to listen to either of two tape recorders at the push of a button.

Precision Step Attenuator Volume Control
Ideal volume control tracking accuracy and noise free performance are two of the considerable benefits of the McIntosh Precision Step Attenuator. It is a thirty-two step, 70 dB range control with unheard of tracking accuracy within 1 dB. The extreme accuracy is obtained through special electronically controlled resistance element trimming. The accuracy and quiet operation are maintained because the switch commutator touches, only the switch contact pad and not the precision resistor elements.

True Loudness Compensation
In the past, loudness controls have typically used simple passive circuits connected to a portion of the rotation range of the volume control. As a consequence, loudness compensation accuracy was dependent on many variables such as speaker efficiency, amplifier gain and differences in input level. The MA 6200 loudness control is continuously variable, operates independently of the volume control, and its contour is accurately modeled after the Fletcher Munson family of "Equal Loudness" curves.

Five Band Program Equalizer
Five separate controls permit individual musical spectra shaping in two octave segments to satisfy personal preference or program limitations. There is 12 dB plus or munus control at center frequency of the individual segments. The center frequency are 30, 150, 500, 1500 and 10,000 Hz.
 Dual Tape Monitor And Tape Copy Switches
Two tape recorders can record simultaneously from the program being listened to or you may record from one to the other without interfering with the "Listen" program.

Power Guard Indicator and Protection Circuit
Two red power quard indicators indicate when the power amplifier has reached full output. At this point the power guard circuit begins to control amplification dynamically so that you will not hear the harsh distorted sound of square wave clipping. In addition your speakers are protected from burnout.

Very Low Impedance Phono Preamplifier
A new state-of-the-art. Technology operational amplifier is arranged in a low impedance circuit to reduce noise to the lowest achievable level. The circuit follows the RIAA equalization curve.

Preamp Output -  Power Amp Input Connections
Back panel connections provide the ability to insert room equalizers, reverberation units or other signal processing devices.

Low Noise High Performance Op-Amps
New technology low noise operational amplifiers give lower noise and greater band width than conventional devvices.
Electronic Active Filter Elements
"Active filter" technology is used to generate the equivalent of the inductors normally used in equalizer filters. This eliminates the hum pickup of inductance non linearity than often occurs from conventional inductors.

"LED" Function Indicators
System status is indicated by long life "LED " indicators

Turn-on Transient Elimination Circuits

Speaker outputs are connected only sfter power supplies and circuits have stabilized eliminating turn on thumps or clicks

Harmonic Distortion
Harmonic distortion does not exceed 0,05% when measured from the phono input to the speaker output from 20 Hz to 20 kHz at all power levels from 250 mW to full rated output.

Auto Turn On/Turn Off
Power to the entire stereo system can be controlled from either the front panel power switch or the turntable's power switch. A current sensing relay connected to the turntable AC power outlets is controlled by the turntable power switch. The relay, in turn controls the AC power to the remainder of the system.

Speaker switches for Three Sets of Speakers
Three sets of loudspeaker may be used one at a time, two together, or all three simultaneously.

Speaker Protection Circuits

Loudspeaker are protected from burnout by the Power Guard circuit and also by other circuit that instantaneously disconnect the speakers in he presence of DC on  the output.

Specifications
Power Output:
75watts minimum sine wave continuously average power output per channel, both channel operating into 4 Ω (20 Hz - 20 kHz, THD no more than 0,05%)
100 watts minimum sine wave continuously average power output per channel, both channel operating into 8 Ω (20 Hz - 20 kHz, THD no more than 0,05%)
Output Load Impedance:  4 Ω , 8 Ω
Rated Power Band:  20 Hz to 20 kHz
Total Harmonic Distortion:  0,05% (max imum at any power level from 250 milliwatts to rated power per channel20 Hz to 20 kHz)
Intermodulation Distortion:  0,05%  (max imum at any power level from 250 milliwatts to rated power per channel with both chanels operating for any combination of frequencies 20 Hz to 20 kHz)
Frequency Response:  20 Hz to 20 kHz +0, -0,5 dB at rated power
Hum and Noise:
Power Amp :  105 dBA, 100 dB unweighted, below rated output
Tape, Aux Input :  100 dBA, 95 dB unweighted below rated output
Phono Input:  85 dBA, 80 dB unweighted, below 10 mV input
Damping Factor:  Greater than 30
Input Sensitivity / Impedance:
Power Amp :  2,5 V/22 k Ω
Tape, Aux :  250 mV/100 k Ω
Phono :  2 mV/47 k Ω, 100 pf
Tape Output:
Aux, Tape :  250 mV with rated input
Phono :  250 mV with rated input
Program Equalizer:  ±12 dB at 30, 150, 500, 1500, and 100,000 Hz
Semiconductors Complement:
42 Transistors; 13 IC; 25 Diodes; 1 Silicon Controlled Rectifier
AC Power Outlets:
2 Automatic current sensing (green)
3 Switched (black)
Power Requirement:  120 V, 50/60 Hz; 0,5 to 4 amps (50 to 400 watts)
Dimensions:
Front  Panel (W x H) :  406 x 138 mm (16" x 5-7/16")
Chassis (W x H x D):  375 x 122 x 330 mm (14-3/4" x 4-13/16" x 13")
Including PANLOC  shelf and back panel connectors.
Knob clearance required is 32 mm (1-1/4") in front of the mounting panel
Weight: 
Net :  13,6 kg (30 pounds)
Shipping :  19,1 kg (42 pounds)
Finish:  Front panel is anodized gold and black with special gold/teal nomenclature illumination. Chassis is black
Mounting:  Exclusive McIntosh developed professional PANLOC

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