McIntosh C504 Brochure

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 con-
tinuously 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"
shown in optional walnut veneer cabinet
BEST COMPACT PREAMPLIFIER!
C 504
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 inter-
connecting 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 con-
trols. The center frequencies of the controls are 30
Hz, 750 Hz and 10K Hz. Plus and minus 12 dB of con-
trol is available. Use of the program equalizer con-
trols 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
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 in-
tegrated circuit operational amplifiers. Noise fac-
tors are incrediably low, and distortion levels are at
or below the limits of present day test equipment.
amplifier section of the