Audio Database


McIntosh C504 a price point -- unknown (1980 release)

Control amplifier of a compact size.

IC is used for all the input changeover switches.
The circuitry was made to turn on and off on minute DC voltage, and the frequency characteristic was not affected, but it has succeeded in suppressing an occurrence of a switching noise.

A coordination of ±12dB can be performed focusing on each frequency of 30Hz, 750Hz, and 10kHz, and tone control is free.

A loudness control is controllable with the "LOUD" thumb on a succession variable target.
In the location of FLAT, if the flat frequency characteristic is acquired and it turns to the right with the maximum volume, a volume will fall and the loudness effect will increase it.
The loudness effect is a system which makes low-pass increase according to the property of the ear of the human being when hearing it in a low volume, and controls the balance of a sound volume versus a tone quality.


Rating of a mode
Form Preamplifier
Frequency characteristic 20Hz - 20kHz
Distortion 0.02% or less (at the time of 20Hz - 20kHz, and 2.5V output)
Input sensitivity/impedance Phono1, 2:2.2mV/47kohm (50pF)
AUX, Tuner, Tape1, 2:250mV / 47kohm
A hum and a noise (SN ratio) Phono1, 2:IHF 90dB, 10mV or less
AUX, Tuner, Tape1, 2:IHF 100dB, 250mV or less
An Output voltage/impedance Main output: Less than 2.5V/100ohm
Tape output : 250mV/200 ohms or less
Equalizer property 30Hz, 750Hz, 10kHz : ±12dB
The semiconductor used 15Tr, 14FET, 11Di, 11IC
Power source AC120V, 50Hz/60Hz
Power consumption 45W
Dimensions Front panel: Width 406x92mm in height
Main unit: Width 375x height 60x depth of 368mm
Weight 6.4kg