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Example: Connect the output of recorder 1 to

TAPE 1 input on the C 26. Connect the TAPE 1
output on the C 26 to the input of recorder 1. In

the same way, connect the output of recorder 2 to

TAPE 2 input on the C 26. Connect TAPE 2 output

of the C 26 to the input of recorder 2.

By setting the C 26 input selector switch at

TAPE 1, a recording can be made on tape recorder
2 from a tape playing on tape recorder 1. The re-
cording can be monitored from the playback of
tape recorder 2 by pushing the TAPE 2 monitor

button.

The tape recorder functions can be reversed by

setting the input selector switch at TAPE 2. A re-
cording can then be made on tape recorder 1,
from a tape playing on tape recorder 2. The re-
cording on tape recorder 1 can be monitored from
the playback of tape recorder 1 by pushing the

TAPE 1 monitor button.

The C 26 preamplifier can also be used with one

recorder for recording other program sources while
playing tapes from a second recorder.

Example: Connect the output of tape recorder 1

to the TAPE 1 inputs of the C 26. Connect the out-

puts of tape recorder 2 to the TAPE 2 inputs of the

C 26. Connect the TAPE 2 outputs of the C 26 to

the inputs of tape recorder 2.

A recording from AUX, TUNER, PHONO 1 or

PHONO 2 can be made on tape recorder 2 if the

selector switch is set to the corresponding source

position. The recording on tape recorder 1 can be
monitored for playback by pushing the TAPE 2

monitor button. At the same time, the C 26 can be
used to play a tape from tape recorder 1 by releas-
ing the monitor button for TAPE 2 and pushing the
monitor button for TAPE 1. The signal of tape

recorder 1 will then go to the main preamplifier

outputs without affecting the recording being made
on tape recorder 2.

Tape recordings can be made simultaneously on

two tape recorders by using PHONO 1, PHONO 2,
AUX or TUNER as a program source. The tape

recorders should be connected as described in

example 1. Set the input selector switch to the
desired source. The recording on either tape re-

corder can be monitored for playback by pushing
the appropriate tape 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 particular re-
corders intended for this use.

SPEAKER SWITCHES

To switch the main and remote stereo speakers

using the pushbuttons on the front panel, the

power amplifier output leads must be connected

to the amplifier output terminals on the rear of the
C 26. The main speakers must be connected to the

main speaker terminals and the remote speakers

to the remote speaker terminals. If either main or

remote speaker button is pushed to OFF, load
resistors are automatically connected to the power

amplifier to compensate for the speaker. The
headphone output is always connected through
level matching resistors to the amplifier terminals
regardless of the position of the main or remote

switches.

8

Using the

Front Panel Controls

In the upper right of the front panel is the VOL-

UME-ON/OFF control.

Turning the VOLUME totally counterclockwise

turns the C 26 OFF. The VOLUME control regu-

lates the loudness in both channels. The VOLUME
control has been precision tracked throughout the

listening range (0 to -65 dB) for accurate stereo
balance.

MODE SELECTOR: Connects the program to the

loudspeaker in the following seven ways:

L to L & R: Connects the "left" input to both

loudspeakers.

R to L & R: Connects the "right" input to both

loudspeakers.

STEREO REV: Connects the "left" input to the

"right" loudspeaker and the "right" input to

the "left" loudspeaker.

STEREO: Connects the "left" input to the "left"

loudspeaker and the "right" input to the
"right" loudspeaker.

MONO (L + R): adds the "left" input and the

"right" input and then connects the  L + R

program to both amplifiers and loudspeakers.

L + R to L: Connects the "left plus right" pro-

gram to the "left" loudspeaker only.

L + R to R: Connects the "left plus right" pro-

gram to the "right" loudspeaker only.

INPUT SELECTOR:

Aux: Connects the output from any high level pro-

gram source requiring flat amplification to the high

level input stage. Such a source could be a tele-

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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