McIntosh MC-30 Manuel utilisateur

INSTRUCTION MANUAL

MciNTOSH MODEL Me-30

U.S.A.

30 WATT POWER AMPLIFIER

Type A-116B

Serial

15329 and Over

MciNTOSH LABORATORY, INC

2 Chambers St. Binghamton, N. Y.

1.5M·757·HPB

ELECTRICAL AND MECHANICAL SPECIFICATIONS

Specifications for the Mcintosh Model MC-30 Audio Amplifier

Power Supply 117/125 volts, 50/60 cycles

Power Consumption 135 watts at 30 watts output

105 watts at zero signal output

Power Output 30 watts continuous

Input Level Input # 1 (pin jack and screw terminals and pin 5

of pre-amp socket) .5 volts to 30 volts, with gain control

Input #2 (pin 2 of pre-amp socket) 2.5 volts, (For

use with McIntosh pre-amplifier equipment).

20 to 30,000 cycles

-+-

.1 db at 30 watts output

15 to 50,000 cycles

-+-

.5 db at 30 watts output

10 to 100,000 cycles

-+-

1 db at 15 watts output

Frequency Range

Harmonic Distortion Less than 113% at 30 watts output or less, 20 to 20,000

cycles

Intermodulation Distortion Less than 112% if instantaneous peak power is below

60 watts for any combination of frequencies 20 to

20,000 cycles

Impulse Distortion Negligible

Noise and Hum Level 90 db or more below rated output

Damping Factor

Input Impedance

12 or better for 4,8 and 16 ohm output, 16 for 600 ohms

0.5 meg for 0.5 volt input and 0.13 meg for 2.5 volt

input. 20 cycles to 40 Kc

4,8, 16 and 600 ohms (600 ohm is balanced to ground)

20 cycles 3°

20,000 cycles 9°

Output Impedance

Size 13 x 8 x 8 high, chassis type construction

Phase Shift

Tube Complement Pre-Amp: 12AX7

Phase Inverter: 12AU7

Voltage Amp: 12BH7

Driver: 12AX7

Output: 2-1614

Rectifier: 5U4-GA

Auxiliary Equipment

connection ( Pre-Amp

input receptacle)

Designed to power

C-8

and other McIntosh Pre-

Amplifiers

Weight 30.5 pounds net

Finish Chrome and Black

-1-

DESCRIPTION

The Mcintosh Model MC-30 is a 30 watt high fidelity power amplifier designed for home entertainment

systems and professional applications. The Model MC-30 is similar to the earlier Mcintosh Model A-116

30 watt amplifiers and includes all of the rigid electrical specifications and features found in these earlier

units plus: less than 1/3% harmonic distortion at any power output up to 30 watts and at any frequency in

the audio spectrum, 20 to 20,000 cps; less than 112% intermodulation distortion if instantaneous peak power

is below 60 watts for any combination of frequencies 20 to 20,000 cps; and noise and hum level 90 db or more

below rated output. The famous Mcintosh high efficiency output circuit is used to obtain the high standard

of performance found in this amplifier.

The MC-30 may be operated from any signal source delivering 0.5 or more volts, or directly from a

Mcintosh Audio Compensator or Pre-Amplifier, such as the Models

C-8 C-4 C-I04

or C-108. Output im-

pedances of 4, 8 and 16 ohms are provided for direct connection to loudspeakers. An additional 600 ohm out-

put is present for use with lines, etc.

INST

ALLA

TION

Location

The MC-30 should be located in a ventilated area. If the amplifier

housed m a cabinet or other en-

closure, holes should be provided for air circulation.

Input

Connections

1. When a Mcintosh Audio Compensator or other Mcintosh pre-amplifier is used with the MC-30, plug

the pre-amplifier's output-power cord into the Pre-Amp input receptacle on the MC-30 and turn the gain

control fully counter clockwise. This receptacle supplies the required plate and filament power to the pre-

amplifier equipment as well as providing the necessary audio connection.

For pre-amplifier installation and operation refer to the pre-amplifier's instruction manual.

2. When a signal source of 0.5 volts or more is used to drive the amplifier, such as the output from a

tuner, tape recorder, or pre-amplifier, plug the source into the 0.5 volt input pin jack receptacle or con-

nect to the 0.5 volt and GND screw terminals. Use the gain control to obtain the desired operating

level.

If desired, the signal source may be wired to an octal plug for insertion in the octal Pre-Amp input re-

ceptacle. In this case connect the input lead to pin

5 and the ground lead to pin

1. When using this con-

nection the source must not have a DC output component.

Output

Connections

The MC-30 has output impedances of

4, 8

and 16 ohms available at either the screw terminal connector

or the output socket. In addition, a 600 ohm output (balanced to ground) is available at the output socket.

See schematic diagram for socket connections.

It is important that the loudspeaker or other load be properly matched to the amplifier if best 'perform-

ance is to be obtained. Because many loudspeakers do not have voice coil impedances exactly matching

4, 8

and 16 ohms, the following table lists suggested connections for best impedance matching.

Speaker Impedance 3.2 to 6.5 ohms 6.5 to 13 ohms 13 to 32 ohms

Connect To

ohms

ohms 16 ohms

WARNING: Output plugs wired for McIntosh 20W-2 and 50W-2 amplifiers must not be used with

the MC-30 without rewiring the plug.

Power

Connections

The MC-30 operates from any 110 to 130 volt 50-60 cycles power line. (When continuous use

con-

templated on 120 to 130 line volts the transformer primary should be re-connected using the 125 volt tap.)

When the MC-30 is used with the McIntosh Pre-Amplifier equipment, tuners, or other associated equip-

ment the MC-30 power cord is plugged into the receptacle at the rear of these units. When thus connected

the power switch of these units controls the MC-30.

GUARANTEE

We guarantee the performance of this equipment and the mechanical and electrical workmanship to be

free of serious defects for a period of 90 days. This guarantee does not extend to components damaged by im-

proper use nor does it extend to transportation to and from the factory.

SERVICE INFORMATION

All McIntosh equipment

designed for long trouble free operation. All components are of highest

quality and are conservatively operated. If trouble develops the amplifier may be serviced by your franchised

dealer, a competent serviceman, or returned to the factory. Equipment will not be .accepted at the factory

unless factory return authorization is first received. The following chart of operating voltages and resistances

is offered as a guide for servicing the unit. All voltages and resistences are measured to chassis except

those with asterik (*). These are measured to chassis with pin #2 of either 5U4GA grounded. Voltages are

measured with high impedence VTVM. NOTE-UNIT MUST BE TURNED OFF WHEN MEASURING

RESISTENCES.

Tube

12AX7

(input)

12AU7

·12BH7

VOLTAGE AND RESISTANCE CHART

DC Volts

Pin No. No Signal

1120

-e-

1.1

5Filament

6,7

9Filament

1240

2120

8129

5Filament

6 240

9Filament

1352

818

5Filament

6352

9Filament

DC Volts

30Wout AC Volts

30Wout

102

1.5

.42

(6.3V AC to pin 9)

210

102

108

(6.3V AC to pin 9)

210

1.5

Resistance

Unit Off

380K*

27K (gain

C.C.W.)

3.3K

-&-(hum

C.C.W.)

40K*

380K*

18K

40K*

2.5K*

295 132 12.2Kx-

-&- 10 220K

15.5

1.2K

(6.3V AC to pin 9)

295 132 12.2K*

10 220K

--4-

DC Volts DC Volts AC Volts Resistance

Tube Pin No. No Signal 30Wout 30Wout Unit Off

12AX7 1440 375 98 205*

2-42 -41 132 l.1M

3-42 -42 132 150K

4 & 5 Filament (6.3V AC to pin 9)

6 440 375 98 205*

7-42 -41 132 l.1M

8-42 -42 132 150K

9Filament

1614 1

..g...

-o-

-o

-e-

2Filament (6.3V AC to pin 7)

3440 375 98 205*

4440 375 98 205*

5-42 -42 132 150K

7 Filament

5.5 98 19

5U4 1

2Filament 460 410 8.8 (ripple) 0*

4370 44

6370 44

8 Filament (5.0V AC to pin 2) 0*

U. S. Patents No. 2,477,074; 2,545,788; 2,646,467; 2,654,058 others pending

McINTOSH LABORATORY, INC.

2 Chambers Street

Binghamton, N. Y., U.S.A.

In Canada: Manufactured Under License by McCurdy Radio Industries, Ltd.

22 Front Street West, Toronto, Canada

l~~~ ~~ __

=======================~

Ou-tput Connections

Using Octal Socket

4 ohms - pins 1 and 2

8 ohms -

Lns

1 and 3

16 ohms - pins 1 nnd 4

600 ohms -

plns

and

(pin 6

CT and ground)

70.7 Volts - pins 5 and 6

(pin

ground)

Pre-Amplifier Input

Soclce

Connections

1 -

ground

2 - pre-amp input (2. 5V)

3 -

not

used

Pin 4 -

+310v

3.5

ma ,

5 -

.Sv input

6 - not used

Pins

and

8 -

6.3V

lamp.

Note

t -

This jumper strap

mny be removed

ungrounded

low impedance outputs are

deslred.

Rl SOOK

Pot.

Gain

Adj.

R2 lOOK

R3 27K

3.3M

R5 3. 3K

R6 68

ohms

R7 lOOK

R8 330K

R9 680K

RlO

18K,

Rll

R12 1M

R13

2.2K, 5%

R14 27K, 5%

R15 30K,

R16 220K

R17 1.2K

RIB 220K

RIg

12K,

2W*

R20 12K, 2W*

R21 120K, 5%

R22 1M Cl

R23

820K,

5% C2

R24 1M C3

R25 220K C4

R26 220K C5

R27 10K, lOW C6

R28

150 ohm

lOW C7

R29

250

ohm Pot.

R30 3.3K C9

R3I 2.2M CI0

R32 330K Cll

R33 220K C12A

R34 220K C12B

R35

IBOK

C12C

*Matched to wi thin 1%

C13

M·l 2.5 47

PRE-AMP INPUT OUTPUT

,.INPUT-, ~OUTPUT-----,

5V. GND. GND.COM 4 8 16

J-t(Jr

7 2

6 3

5 4

:1[, ,

r ,

I ,

3 ~

I I

~' , .cr

I I

I \ '

I I I

- ~NOTEI

-1----

.5V INPUT

FIL.

-c::..

IM'150B

-L

-rr--

Ir-

MclNTOSti LABORATORY, INC.

SERIAL NOS. 15329

AND

ABOVE

MODEL MC-30, TYPE A-116B, POWER AMPLIfiER

MC-30'4

D TI'

5·15-56

J,W.C.

ll-

GAIN

· lmf, 400V

· 47mf, 2DOV

100mf,

12wv

· 22mf, 400V

· 22mf,

400V

· Imf

400V

470mmf, 500V

.047mf,

600V

.04

7mf

600V

· 25mf, 60DV

.25mf,

600y

40mf, 500V

80mf,

450V

20mf, 450V

10mf, 450V

RI3

I '\ \ 'vI

I I I

RECf. R30 M·152B

TOFIL.

R29

HUM ADJ.

L-

---l111 TO FIL.

IRI4~ R16~

S'"

15 ~18~

-L-

_ 0

c :z4 •••..

.1\--

I-='-

~R24 ~

R26

-L-

I\C7

marrant~

Mcintosh laboratory warrants the electrical and mechanical workmanship and compo-

nents of this equipment to be free of serious defects for a period of 90 days provided the enclosed

warranty card is duly completed and returned to Mcintosh laboratory.

Mcintosh laboratory further warrants the transformers supplied as components of this

equipment to be free of manufacturing defects for a period of 1 year from the date of shipment

from the factory. Mcintosh laboratory will replace at no charge any such transformer failing to

meet this warranty period.

This warranty does not extend to components or transformers damaged by improper use,

nor does it extend to transportation to and from the factory.

~ «:»

~+VSL-,

mcintosh

Laboratory, Inc.

2 CHAMBERS

ST. ,

BINGHAMTON, NEW YORK

©GOES Mao

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