GENERAL DESCRIPTION
The dramatic difference in the quality of music reproduced through
a Mclntosh instrument is due to low distortion. The distortion of your
MC2505 is guaranteed to be less than 0.25% at any frequency from
20 Hz to 20 kHz with both channels operating at 50 watts RMS.
Distortion is measured at full rated power output with both channels
operating. At less than rated power, distortion becomes so small it
can be measured only by the most sophisticated laboratory instru-
ments. Only Mclntosh gives you this kind of performance.
Your MC2505 passed more than 75 tests before it was ready for
you. Each connection, wire, resistor, capacitor is checked and re-
checked. All specifications are checked. Mclntosh testing takes time.
The extra investment in thorough testing assures you of greater
musical enjoyment.
The performance of your Mclntosh MC2505 is backed by a money
back guarantee. Only Mclntosh gives you a money back guarantee
of performance. Your MC2505 must be capable of meeting its pub-
lished specifications or you get a refund of your purchase price.
Mclntosh promises performance. We either meet our promise or you
get your money back.
Your MC2505 can be protected by a free three year factory service
contract. Take advantage of this service. Fill in the application card
found in the owner's packet. The free three year factory service
contract covers parts and labor. If anything goes wrong just bring
your MC2505 to a factory service station, or return your MC2505
to Mclntosh. All parts and labor necessary to repair your MC2505
will be supplied free of charge. Fill in the service contract applica-
tion found in the owner's packet now.
2
A two stage preamplifier with three transistors in each channel
increases the input voltage 16 dB.
There are 13 transistors in each power amplifier section. The two
stage preamplifier is fed to a pair of matched transistors arranged
as an emitter coupled amplifier with two inputs and one output.
The signal from the preamplifier section connects to one of these
inputs. Both AC and DC negative feedback are applied to the other
input. This large quantity of feedback is used to reduce noise and
distortion. The signal is then fed to a voltage amplifier. The volt-
age amplifier is followed by two driver transistors.
The output section is arranged as a series push-pull amplifier.
The power transistors used in the output section of your MC2505
are selected for their high power dissipation capability, wide
frequency response, and large "safe operating area." In addition,
each power transistor is given four separate tests before it is put
in your MC 2505. This additional testing makes sure your MC 2505
will deliver its rated power from 20 to 20 kHz with low distortion
and complete reliability.
The power transistors are mounted on oversized anodized heat
sinks. The heat sinks assure that under normal operation the
transistors will operate at a low temperature. If temperatures in-
crease due to a shorted speaker, or restricted ventilation, an auto-
matic temperature sensing device turns off the MC2505. The
device operates automatically at a preset temperature. The MC
2505 will turn on again when the temperature has returned to
normal limits. This additional feature gives your MC2505 com-
plete reliability under the most extreme operating conditions.
TECHNICAL DESCRIPTION
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