McIntosh MR66 Operations Instructions download pdf (Page 3)

MR66 STEREOPHONIC TUNER

INTRODUCTION

The Mclntosh MR66 is a precision engi-

neered, sensitive AM-FM stereo tuner. It

offers the finest possible reception of AM and

FM broadcasts. Every desirable feature is

included on the MR66. It is perfect for use in

a stereo system where nothing less than

THE BEST will do.

Once you have used the MR66 and en-

joyed its outstanding performance, you will

understand why Mclntosh products have

earned their reputation as THE BEST.

The MR66 is quite flexible in operation. It

receives monophonic FM, monophonic AM

and stereophonic AM-FM broadcasts. It also

receives FM multiplex stereophonic broad-

casts with the simple addition of the Mcln-

tosh MA6 multiplex adapter. The MR66 front

panel control and switch facilities provide for

every desirable mode of tuner operation.

Your Mclntosh MR66 tuner will give you

years of the finest possible AM and FM

reception and will become a highly valued

part of your home music system.

TECHNICAL DESCRIPTION

FM SECTION

The MR66 FM RF tuning section uses a

special cascode amplifier that amplifies the

weakest signals and yet maintains low noise

and freedom from spurious signals. An

additional tuned RF circuit combined with a

4 gang tuning capacitor contributes greatly to

the excellent selectivity and high rejection of

spurious signals.

A newly developed Automatic Frequency

Control (AFC) circuit greatly simplifies tuning.

As the tuning knob is moved, the tuner re-

sponds as if there were no AFC action.

Approximately 3 seconds after the dial has

come to rest on a particular station, the AFC

circuit gradually comes into operation. The

AFC action automatically brings the electrical

tuning to the correct point for minimum dis-

tortion. This automatic tuning repeats its

action each time the tuning dial is moved to a

different station. The amount of AFC action

is fully adjustable with a front panel control.

The unique AFC circuit uses a variable-

capacitance silicon diode in place of a con-

ventional tube to improve the over-all AFC

performance. The silicon diode is unaffected

by temperature changes, has no warmup

drift, and eliminates tube filament hum. A

special temperature-compensated narrow-

band detector supplies operating signals to

the AFC circuit to insure positive action.

The narrow-band detector also operates the

FM tuning meter amplifier and the ultrasonic

interstation muting circuit.

Three flat-topped response IF amplifiers

reject adjacent channel interference and

provide adequate gain to operate both

limiters on even the weakest signals. Two

limiters are used to insure the best possible

signal-to-noise ratio. Both the RF and IF

circuits are completely shielded and exceed

the FCC requirements for suppression of

FM oscillator and IF frequency radiation.

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