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How to Connect

CONNECTING A RECORD PLAYER TO PHONO 1

Connect the cable from the "left" channel of the

record player into the "L" PHONO 1 input jack.

Connect the cable from the "right" channel of

the record player into the "R" PHONO 1 jack.

PHONO 2 is provided for the use of a second

record player.

Connect the cable from the "left" channel of the

record player into the "L" PHONO 2 input jack.

Connect the cable from the "right" channel of

the record player into the "R" PHONO 2 input jack.

CONNECTING A STEREO TUNER

Connect the cable from the "left" channel tuner

output to the "L" tuner input jack.

Connect the cable from the "right" channel

tuner output to the "R" tuner jack.

AUX

Any high level program source such as another

tuner or a TV set is connected to the input jacks

marked AUX.

CONNECTING A TAPE RECORDER

To Record:

Connect a cable from the L TAPE OUTPUT jack

marked TAPE 1 to the left high level input of a tape

recorder.

Connect a cable from the R TAPE OUTPUT jack

marked TAPE 1 to the right high level input of the

tape recorder.

Connect a second tape recorder in the same

fashion to the TAPE 2 outputs.

To Playback/Monitor:

Connect the cable from the left channel output

of a tape recorder to the high level inputs . . . L

TAPE 1.

Connect the cable from the right channel output

of a tape recorder to the high level input  . . . R
TAPE.

Connect a second tape recorder in the same

fashion to the TAPE 2 input jacks.

CONNECTING THE C 26 to POWER AMPLIFIERS

Connect the MAIN output jacks to the input of a

stereo power amplifier. The L jack is connected

to the left amplifier input jack. The R jack is con-

nected to the right amplifier input jack.

The output impedance at the MAIN output is 200

ohms. Longer cables than are supplied can be
connected between the C 26 and the amplifiers.

The length of the cable is limited by the capacity
of the cable. The total capacity must not exceed

1,000 pF. For instance: cables with a capacity of

25 pF per foot may be 40 feet long. 13.5 pF per

foot cable may be 75 feet long. The input imped-

ance of the amplifiers should be 47,000 ohms or
greater.

CTR OUTPUT (L + R)

Use the CTR output to feed left plus right signal

to a separate power amplifier for monophonic

background music or for a center channel speaker.

AC POWER OUTLETS

There are 4 black AC power outlets, and one red

AC outlet. The power to the black AC power out-

lets is controlled by the front panel switch. Use

these outlets for a tuner, tape recorder, etc. The

red receptacle is on at all times. Use the red outlet

for a turntable or record changer. The turntable or

record changer is protected by this arrangement.
It is necessary to turn off the turntable or record

changer with its own AC power switch.

GROUND CONNECTION

A single ground post is provided. Grounds for

turntables, record changers, tape decks, etc.
should be connected to this post. The left and

right program cables and the ground wire from

that source should be wound or twisted together.
To avoid hum, make sure the ground wire does

not make any connections to the shields of the left
and right program cables between the program

source and the C 26.

4

Summary of Contents for C26

Page 1: ...READING TIME 32 Minutes Price 1 25 THE MclNTOSH C 26 SOLID STATE STEREO PREAMPLIFIER ...

Page 2: ......

Page 3: ...3 Always have service done by a Mclntosh authorized service agency If the instrument is modified or damaged as a result of un authorized repair the SERVICE CONTRACT will be cancelled Damage by improper use 4 The SERVICE CONTRACT is issued to you as the original purchaser To protect you from misrepresentation this contract cannot be transferred to a second owner 5 For your protection Mclntosh selec...

Page 4: ... which the instrument is to be mounted Position the plastic mounting template over the area of the panel to be cut out for installa tion If the cutout is to be located from the front of the panel begin at step 2 If the cutout is to be located from the rear of the panel begin here 1 On the back of the cabinet panel scribe a vertical centerline through the exact center of the area in which the cutou...

Page 5: ...te and tighten The screw head should pull into the wood slightly Use two inch long screws for panels under inch or two 1 inch long screws for panels inch thick and larger Attach the mounting brackets to the cabinet using four screws Place the template over the mounting screws The mounting screws should be centered in the A and B holes on the template The sides of the mounting brackets should match...

Page 6: ...t the MAIN output jacks to the input of a stereo power amplifier The L jack is connected to the left amplifier input jack The R jack is con nected to the right amplifier input jack The output impedance at the MAIN output is 200 ohms Longer cables than are supplied can be connected between the C 26 and the amplifiers The length of the cable is limited by the capacity of the cable The total capacity...

Page 7: ...TAPE RECORDER 1 TAPE RECORDER 2 TUNER TAPE MACH AC LINE TURNTABLE AC LINE AC LINE 5 FM ANTENNA TUNER GROUND LINE TURNTABLE ...

Page 8: ...AC LINE MONO AMP S T E R E O AMP AC LINE 6 LEFT REMOTE STEREO LOUDSPEAKER SYSTEM RIGHT LEFT MAIN STEREO LOUDSPEAKER SYSTEM CENTER RIGHT MONO LOUDSPEAKER S Y S T E M ...

Page 9: ...h makes it pos sible to instantaneously compare recorded material with the source signal from either of two tape recorders used with the C 26 The recorders used with the C 26 should have separate record and playback heads and separate record and play amplifiers MONITOR With the button pushed in the signal source be comes the program as recorded and is fed through the main preamplifier outputs to t...

Page 10: ...monitor button CAUTION When recording with two tape recorders at the same time from the same program source mutual interference of the recorder bias oscillators can result This can be heard as a howl or squeal in the background when the recordings are played back This noise is caused by insufficient filtering of the bias oscillator circuits in the tape recorders A test run should be made for the p...

Page 11: ...e The bass is then heard in correct proportion to the mid range Turning clockwise toward MAX position reduces the listening volume while automatically boosting the bass for full frequency listening at even the lowest volume levels BALANCE The BALANCE control adjusts for unequal loud ness in either the left or right channels The loud ness of the channels can be varied relative to each other without...

Page 12: ... speakers have been connected to the proper push connecters on the back panel the pushbuttons turn the speakers ON or OFF See Diagram Page 6 If the program is to be heard from the main speakers only the REMOTE pushbutton is pushed IN This turns off the remote loudspeakers If the program is to be heard from the remote speakers only the MAIN pushbutton is pushed IN This turns off the main speakers T...

Page 13: ...HONO 1 or PHONO 2 whichever is connected to the record player you wish to hear 2 Turn the MODE SELECTOR to MONO 3 Adjust the VOLUME control to the desired volume LISTENING TO A TAPE RECORDER The TAPE input is used 1 Turn the INPUT SELECTOR to TAPE 2 Turn the MODE SELECTOR switch to STEREO or MONO depending on the pro gram on the tape 3 Adjust the VOLUME control to the desired volume Two tape recor...

Page 14: ...LS AUXILIARY TUNER TAPE 1 and TAPE 2 to MAIN OUTPUT 20 dB to TAPE OUTPUT 0 dB PHONO 1 and PHONO 2 at 1 000 Hz to MAIN OUTPUT 62 dB to TAPE OUTPUT 42 dB AC POWER OUTLETS 1 unswitched Red 4 switched FACILITIES AND FEATURES BASS Separate 11 position rotary switches for each channel 20 dB to 16 dB at 20 Hz TREBLE Separate 11 position rotary switches for each channel 20 dB to 20 dB at 20 000 Hz LOUDNES...

Page 15: ...level of the left plus right program material at the CEN TER CHANNEL output on the back panel PHASE CONTROL Electronically reverse phase in the left channel to correct out of phase program sources TRANSISTOR COMPLEMENT 18 silicon planar transistors and 3 silicon diodes SIZE Front panel measures 16 inches wide 40 64 cm by 5 7 16 inches high 13 81 cm Chassis measures 15 inches wide 38 1 cm by 5 inch...

Page 16: ...20 FREQUENCY IN HERTZ 20 FREQUENCY IN HERTZ BASS AND TREBLE TONE CONTROL CHARACTERISTICS LOUDNESS CONTROL CHARACTERISTICS 10000 20000 14 100 FREQUENCY IN HERTZ 10000 20000 1000 20 RESPONSE IN dB 0 5 10 15 20 25 20 100 FREQUENCY IN HERTZ 1000 20 15 10 5 0 5 10 15 20 Response in dB 1000 10000 20000 100 Response in dB 20 0 5 10 15 20 Response in dB ...

Page 17: ...ow 50 Hz The slope of the filters is selected for maximum rejection of objectionable noises Careful design has kept the loss of usable program material to a minimum The signal is then fed into the loudness and balance controls The loudness control is con tinuously variable It may be used in conjunction with the volume control Rotating the loudness control produces any loudness compensation for a d...

Page 18: ...Block Diagram 16 ...

Page 19: ......

Page 20: ...MclNTOSH LABORATORY INC 2 CHAMBERS ST BINGHAMTON N Y 13903 607 723 3512 Design and Price subject to change without notice Printed in U S A 038 867 BE032003 ...

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