McIntosh MX 110 Specifications download pdf (Page 4)

2. Correct tuning occurs when the display trace is centered hori-

zontally on the screen. Since the display trace effectively follows

the tuner I.F. response curve, centering the trace tunes the de-

tector to the center of the I.F. curve.

The Ml 3 Maximum Performance Indicator is a versatile instrument.

When used with either a stereo preamplifier, or power amplifier the

Ml 3 when switched to the L+R AUDIO position will show you the

character of the audio signals present. The Ml 3 will:

1. Display a trace along the L+R line when a monaural program

is playing.

2. Will display along the L —R line when a monaural program

source has one channel out of phase.

3. Display a vertical trace if only the left channel is being de-

livered.

4. Display a horizontal trace when only the right channel is being

delivered.

5. Helps you set the precise balance of your system. With the bal-

ance control you can change the angle of the L+R or L—R display.

6. A stereo program will be a complex and varying circular or

elliptical display of irregular outline that depends on channel

separation or on the phase amplitude relation of the left and

right channel.

TECHNICAL

DESCRIPTION

The Ml 3 Maximum Performance Indicator is essentially an oscilloscope

using a three inch cathode-ray tube. Adequate brightness is assured

with a 1350 volt accelerating voltage. A sharper well defined trace is

provided by using separate focus and astigmatism controls.

Two identical direct coupled push-pull amplifiers are used in the hori-

zontal and vertical deflection circuits. Phase shift in each amplifier Is

held to within a few degrees from D.C. throughout the operating

frequency range. Phase differences between vertical and horizontal

amplifiers are held to within a few degrees.

The high voltage power supply uses a selenium rectifier. The low volt-

age supplies use selenium rectifiers, two gas filled rectangular tubes

and an electronic voltage regulator. The operating voltages from

these supplies are carefully regulated over a wide range of power

line variations. This design feature assures a steady indicator trace

despite changing line voltage.

For multipath display the horizontal deflection voltage is obtained

from the tuner discriminator output ahead of the de-emphasis network.

This voltage is proportional to the frequency deviation of the FM

transmission. The maximum width of the indicator screen is designed to

correspond to approximately plus and minus 75 kilocycle deviation of

the FM transmitter.

The horizontal multipath input is connected through the deviation input

jack and the deviation (horizontal) calibration control.

For multipath display the vertical deflection voltage is obtained from

the tuner Automatic Gain Control circuit at the input to the first limiter.

This voltage is proportional to the FM stations instantaneous signal

strength. However, the average proportionally is expotential. Because

of the expotential characteristic, a weak station will produce adequate

vertical deflection. A powerful local station should position the center

of the indicator trace about half to three quarters of an inch below the

top of the vertical scale. The vertical Multipath Input is connected

through the Signal Strength Input and the Signal Strength (vertical)

Calibration Input Control.

For L+R audio display the horizontal deflection voltage is obtained

from the right channel output of a tuner, a preamplifier or even a

power amplifier. The deflection voltage is connected through the

Right Audio Input and the Right Gain Control. For L + R audio display

the vertical deflection voltage is obtained from the left channel output

of a tuner, a preamplifier, or a power amplifier. The deflection voltage

is connected through the Left Audio Input and the Left Gain Control.

With a normal loudness monaural signal both audio input controls are

adjusted for equal deflection of the display trace. (At this point the

trace will be on the L + R line if the two signals are in phase or the

L - R line if they are 1 80° out of phase.)

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McIntosh MX 110 Specifications Page 4

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