McIntosh C500C Instrukcja Właściciela Pobierz pdf (Strona 35)

to the unbalanced Inputs of the C500 are first converted to a

balanced signal before they are amplified. In a similar man-

ner the balanced audio signals are converted to unbalanced

signals before they are available to the unbalanced outputs

jacks.

Moving Coil Preamplifier

One of the popular types of Phono Cartridges for Turn-

tables used today are “Moving Coil”. Due to their design,

the Moving Coil Cartridge’s output voltage is typically in

the range of 300 to 500 microvolts (millionth of a volt) and

thus requires additional amplification in order to match the

output voltage of a “Moving Magnet/Induced Moving Mag-

net” cartridge type with 2.5 to 10 millivolts (thousandths of

a volt). The lower the output voltage of the cartridge, the

greater the level of amplification required and thus the

greater potential for higher noise levels being generated by

the circuitry.

McIntosh has designed a

new Totally Shielded Moving

Coil Preamplifier Module us-

ing special ultra low noise

circuitry with out the need for

a step-up transformer. Refer

to figure 101. The C500

utilizies a double filtered

power supply design, just for

the Moving Coil Preamplifier

Module. It offers the ability to

change the input impedance

from 25 ohms to 1000 ohms in six steps to match a wide

variety of Moving Coil Cartridges.

Technical Description, con’t

Logic Controlled Circuitry

All Inputs, Outputs, Data Ports, Power Control Outputs

and Trigger Outputs are controlled by Logic Circuits in the

C500C. The microprocessor is the heart of the Logic Cir-

cuits and is controlled by McIntosh developed software. It

implements all commands received from the Front Panel

Controls or the supplied Remote Controls and indicates

them on the Alphanumeric Display. Refer to figure 102.

When McIntosh Source Components are connected to

C500C Data Ports, basic command functions from the

C500 Remote Control are passed on to those components,

thus allowing one Remote Control to operate an entire

McIntosh Audio System. The Logic Circuits also sense

whether the C500 Preamplifier or C500 Tube Preamplifier

is connected to the C500 Controller and adjusts the opera-

tional functions automatically.

Meter and Circuitry

The lack of accurate performance in ordinary meters has

presented difficult and complex problems. Ordinary meters

are incapable of indicating the short interval information in

a sound wave. Refer to figure 103. The mass of the meter

movement is

too great to

respond to the

nearly instan-

taneous

changes in

music program

material. That

short interval

information

can have a du-

ration less

than as one-

half of one

thousandth of

a second. Even

if the meter

were capable

of such high velocity movement, the human eye could not

perceive the displayed information. McIntosh solved both

Figure 102

Figure 100

Figure 103

Figure 101

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