Owners Manual

Technical Description

All transistors are selected to have nearly constant cur-

rent gain over the entire current range they must cover.

Output transistors in particular, have matched uniform cur-

rent gain, high current-

bandwidth product and

large active region safe

operating area. To ac-

commodate the high cur-

rent demands of a 4 ohm

loudspeaker, the MC207

Output Circuitry utilizes

a multiplicity of power

output transistors. Refer

to gure 14. An automat-

ic tracking bias system

completely eliminates

any trace of crossover

distortion. Precision met-

al lm resistors and low

dielectric absorption lm

capacitors are used in all

critical circuit locations.

The MC207 is the rst

McIntosh Power Am-

plier to use the newly

developed Dynamic

Power Manager

(DPM)

Figure 13

Block Diagram of the Ampliers

and

Meter Circuitry

(One of Seven Channels Illustrated)

Figure 14

Circuitry. Refer to gure 15 on the next page. The MC207

can easily drive 4 ohm speakers, with their high current

demand. Additionally, the MC207 can be used with 8 ohm