McIntosh C-504 Brochure

C 504

BEST COMPACT PREAMPLIFIER!

When you need a reliable, tow noise flexible preamplifier in a compact size, you need the Mclntosh C 504.

The values to look for in a preamplifier are:

1. QUALITY CONSTRUCTION

2. RELIABILITY

3. MECHANICAL STRENGTH

4. ELECTRONIC STABILITY

5. CONVENIENCE OF OPERATION

6. VERSATILITY

7. SUPERIOR PERFORMANCE

The Mclntosh C 504 is a high technology preamplifier in a compact new case size. The features and performance of the C 504 reflect the latest in Mclntosh Laboratory engineering design excellence.

PRECISION TRACKING VOLUME CONTROL

The volume control, manufactured for Mclntosh Laboratory, is a step attenuator which has tracking

accuracy within 1 dB throughout its entire range. Such extremely accurate matching is achieved through electronically controlled trimming of the resistance material deposited on pairs of miniature printed circuits. Tracking accuracy and quiet perfor-

mance are permanently maintained. Use does not af-

fect performance as in ordinary volume controls.

TRUE LOUDNESS COMPENSATION

The C 504 active circuit loudness control is continuously variable, with constant midrange gain and acts independently of the volume control. The loudness contour is accurately modeled after the Fletcher Munsom family of "Equal Loudness"

curves. Use of this control restores proper listening response at even the softest listening levels.

FET ANALOG INPUT SWITCHING

All critical input switching is done electronically using field effect transistor analog switches. The front panel selector simply switches small amounts of control DC voltage which turn the FET analog switches on or off. Since the FET analog switches are located near the input jacks, the length of interconnecting leads is much shorter. Noise, switching transients, and hum pickup are eliminated.

TRI-FREQUENCY PROGRAM EQUALIZER

Three separate controls allow the balance and

response of musical information to be adjusted with far more flexibilty than with conventional tone controls. The center frequencies of the controls are 30 Hz, 750 Hz and 10K Hz. Plus and minus 12 dB of control is available. Use of the program equalizer controls does not affect in the slightest, the low noise,

low distortion performance of the preamplifier.

When the equalizer controls are in their center or flat detent position, their action is neutral and response of the preamplifier is absolutely flat.

HEADPHONE/OUTPUT AMPLIFIER

The main output amplifier section of the preamplifier is a push-pull complementary class AB circuit. Because of the extremely low distortion and power capability of this circuit it is used for both main and headphone outputs.

INTEGRATED CIRCUIT OPERATIONAL AMPLIFIERS

Both the magnetic phono and the equalizer

amplifier stages utilize new high technology integrated circuit operational amplifiers. Noise factors are incrediably low, and distortion levels are at or below the limits of present day test equipment.

shown in optional walnut veneer cabinet

C 504 Performance Limits

Performance limits are the maximum deviation from perfection permitted for a Mclntosh instrument. We promise you that when you purchase a new C 504 from a Mclntosh Franchised dealer it will be capable of performance at or exceeding these limits or you can return the unit and get your money back. Mclntosh is the only manufacturer that makes this statement.

FREQUENCY RESPONSE

+ 0 -0.5 db from 20Hz to 20 kHz

OUTPUT LEVELS

Main Out Headphone

Tape Out

DISTORTION

0.02% maximum at 2.5V output from 20 Hz to 20 kHz

INPUT SENSITIVITY AND GAIN

Input to Main Out

Phone 1 and 2

Tuner, Aux, Tape 1 and 2

Input to Headphone Out

Phono 1 and 2

Tuner, Aux, Tape 1 and 2

Input to Tape Out

Phono 1 and 2

Tuner, Aux, Tape 1 and 2

SIGNAL TO NOISE

Phono 1 and 2 -90 dB IHF A-weighted,

Tuner, Aux, Tape 1 and 2 - 100 dB IHF A-weighted,

PERFORMANCE GUARANTEE

2.5V

750mV

250mV

2.2mV in for 2.5V out (61.1 dB gain at 1 kHz) 250mV in for 2.5V out (20 dB gain at 1 kHz)

2.2mV In for 750mV out (50.7 dB gain at 1 kHz) 250mV in for 750mV out (9.5 dB gain at 1 kHz)

2.2mV in for 250mV out (41.1 dB gain at 1 kHz) 250mV in for 250mV out (0 dB gain at 1 kHz)

below 10mV input

-80 dB unweighted,

below 10mV input

below 250mV input

-90 dB unweighted,

below 250mV input

INPUT IMPEDANCE

Phono 1 and 2 47kW and 50pF Tuner, Aux, Tape 1 and 2 47kW

OUTPUT IMPEDANCE

Main Out

Headphone Tape Out

EQUALIZER CONTROL RESPONSE

Center Fre-

quencies Boost and Cut

GENERAL INFORMATION

POWER REQUIREMENT

120 Volts 50/60 Hz, 25 Watts

SEMI CONDUCTOR COMPLEMENT

15 Transistors

less than 100W (to operate into

5kW or greater)

less than 200W (to operate into

5kW or greater)

30,

750,

and 10 kHz

±12 dB

14 Field Effect Transistors

11 Silicon Diodes

11 Integrated Circuits

MECHANICAL INFORMATION

SIZE: Front panel measures 16 inches wide (40.6 cm) by 3 5/8

inches high (9.2 cm). Chassis measures 14 3/4 inches wide (37.5 cm) by 2 3/8 inches high (6.0 cm) by 14 1/2 inches deep

(36.8 cm), including connectors. Knob clearance required is 1

1/4 inches (3.2 cm) in front of mounting panel.

FINISH: Front panel is anodized gold and black with special

gold/teal nomenclature illumination. Chassis is black.

MOUNTING: Exclusive Mclntosh developed professional

PANLOC

WEIGHT: 14 pounds (6.4 kg) net, 25 pounds (11.3 kg) in ship-

ping carton.

039252

FRANCHISED DEALER

Printed in U.S A

MCINTOSH LABORATORY INC.

2 CHAMBERS ST., BINGHAMTON, N.Y. 13903

607-723-3512

The continuous improvement of its products is the policy of

Mclntosh laboratory incorporated, who reserves the right to improve design without notice.