McIntosh MC-60 Brochure
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perfect amplification!
99
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*AII but 0.000016 of power output is
perfect reproduction of input signal ot
60 walls, 20-20,000 cycles.
FOR THOSE SATISFIED WITH NOTHING
BUT THE ULTIMATE IN HIGH FIDELITY,
IT'S THE McINTOSH 60 WATT AMPLIFIER
- UNSURPASSED FOR PERFORMANCE
AND QUALITY.
This unique instrument sets a standard of ex-
cellence in amplification, for it has reached the
theoretical limit of quality and efficiency. The
McIntosh MC-60 amplifier, with patented cir-
cuit, is the only power amplifier which will pro-
duce 60 watts of power at less than 0.3% distor-
tion from 20 to 20,000 cycles per second. This
measurement insures the complete absence of
discordant tones, and provides the purest and
most perfect amplification available. There is no
YOUR FRANCHISED MciNTOSH DEALER PROUDLY RECOMMENDS AND DISPLAYS
MciNTOSH EQUIPMENT
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increase in distortion even when extra power is
demanded by program material. Since nothing
is added to or taken from the input signal,
clean, unparalleled reproduction of sound re-
sults, bringing out an exquisite realism at low,
as well as high, volume levels .. , clear lucid
highs, with no peaking; natural, full bass with
no booming; thrilling middle range, all there
with the McIntosh.
In reproducing music or speech with complete
realism, the exceptional reserve power capacity
of the MC-60 is called upon, for many short in-
tervals per second, even at moderate volume, to
fe-create faithfully and accurately all the funda-
mentals, harmonics and overtones present in
natural sounds.
MC-60 SPECIFICATIONS
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11 7/1 25 volts, 50/60 cycles Noise and
Hum
Level:
2ao watts at 60 watts output
155 watts at zero signal output
Input#1 (pin jack and screw terminals)
.5 volts to 30 volts, with gain control
Input#2 2.5 volts
±
watts output
15
to
watts output
10 to
watts output
Less than 0.3%at 60 watts output or
less, 20 to 20,000 cycles
Less than 0.5%if instantaneous peak
power is below 120 watts for any com-
bination of frequencies 20 to 20,000
cycles
50,000
100,000
cycles
cycles
cycles
30,000
20 to
0.1 db at
±
0.5 dbat60
±
1 db at
15 or better for 4, a and 16 ohm output,
16 for 600 ohms
0.5 meg for 0.5 volt input and 0.13 meg
for 2.5 volt input 20 cycles to 40,000
4, a, 16,600 ohms (600 ohm is balanced
to ground), and 70.7 volts
60
30
Auxiliary Equipment
Connection:
Rectiller: 2-5U4 GA
Pre-Amp: 12AX7
Phase Inverter: 12AU7
Voltage Amp: 12BH7
Driver: 12AX7
Output: 2-6550 /KT8 8
14
',4"
x 10" x a" high, chassis type con-
struction
75
The famous Mcintosh patented Unity
Coupled circuit with billiar output
transformer as used in all Mcintosh
power amplillers.
the exclusive Patented" Mcintosh Circuit
brings you purest High Fidelity Sound ..
The Mdntosh circuit is fundamentally new. It provides practically
100% coupling between primary windings of the output transformer
by winding the primary wires together, or bifilarly. For the first
time the high efficiencyof class "B" amplification can be used with
high quality performance. Wave form distortion, causing listening
irritation, due to switching transients between each half of the
class "B" amplifier is eliminated at all frequencies.
Before 1947, truly faithful amplified sound was severely limited by:
(1) too much distortion; and (2) not enough power capacity. With
the invention of the McIntosh circuit for the first time less than 1
distortion became the performance standard.
The McIntosh circuit has an inherent large advantage over conven-
*McIntosh Laboratory, Inc., introduced Unity Coupling to High Fidelity
%
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O'
" 2 DB
'-1
f I
0 db
6~ WATTS
....••••..•
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-2 DB
DB
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tional circ\lits. By bringing the output tubes electrically four times
closer together the impedance isY4that of the conventional circuit.
The coupling to the secondary is improved by a similar factor of
4 to 1 since the primary to secondary turns ratio has been reduced
2 to I. The12cathode,
of 12 db, which with additional loop feedback, offers the lowest dis-
tortion, most stable power amplifier made.
To date, Mdntosh amplifiers alone are able to provide Jess than
0.3% harmonic distortion and Jess than 0.5% intermodulation dis-
tortion (discordant distortion), for any frequency or for any combina-
tion of frequencies, throughout the audio range, even at full power
output.
in U. S. Patents 2,477,074 (1949); also 2,545,788; 2,646,467;2,654,05
~'2
plate loading provides a feedback factor
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