SOLID STATE STEREO POWER AMPLIFIER MC2505 MC25O5 PRICE $1.
MC2505 TECHNICAL DESCRIPTION LOCKING METERS P E R F O R M A N C E CHARTS 2 2,3 4 5,6 CHARTS 8 SPECIFICATIONS 9 IN A HURRY 10 INSTALLATION 11 TYPICAL HOOKUP 12 CONNECTING 13 BLOCK DIAGRAM 14 OPERATING 15 GUARANTEE 16 The Mclntosh "will to perfection" requires that we probe constantly into the unknown to bring the performance of our electronic equipment closer to perfection than ever before.
GENERAL DESCRIPTION TECHNICAL DESCRIPTION The dramatic difference in the quality of music reproduced through A two stage preamplifier with three transistors in each channel a Mclntosh instrument is due to low distortion. The distortion of your increases the input voltage 16 dB. 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.
The output stages are matched to the load by the Mclntosh autoformer. The Mclntosh autoformer is carefully wound using Mclntosh trifilar winding and interleaving techniques. Trifilar winding and interleaving gives the transformers exceptional bandwidth. The autoformers properly match the power transistors to 4, 8, and 16 ohm loads at all audio frequencies.
D Y N A M I C PEAK LOCKING METERS With the aid of the CBS test record STR100, the frequency response of your phono cartridge can be measured. The graph on page 5 shows the ideal RIAA curve using the CBS record STR100. Ordinary meters lack the capability of indicating the short interval power in a sound wave. The mass of the meter movement is too great to respond to instantaneous changes in music program material.
20 20 FREQUENCY IN Hz 1k 100 FREQUENCY IN Hz 1k IDEAL RIAA SYSTEM RESPONSE USING CBS STR 100 TEST RECORD 100 IDEAL RIAA SYSTEM RESPONSE USING CBS STR 100 TEST RECORD 10k 10k 0 2 4 -20 -20 -18 -16 -14 12 -10 -8 -6 -4 -2 20k 20k -13 -16 14 -12 -10 -8 -6 -4 -2 0 2 4 R E L A T I V E OUTPUT LEVEL IN dB RELATIVE OUTPUT LEVEL IN dB 5
6 20 20 FREQUENCY IN Hz 1k 100 FREQUENCY IN Hz 1k IDEAL RIAA SYSTEM RESPONSE USING CBS STR 100 TEST RECORD 100 IDEAL RIAA SYSTEM RESPONSE USING CBS STR 100 TEST RECORD 100k 10k 20k 0 2 4 -20 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 20k -18 -16 -14 -12 -10 -8 -6 -4 -2 0 2 4 RELATIVE OUTPUT LEVEL IN dB RELATIVE OUTPUT LEVEL IN dB
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TYPICAL PERFORMANCE DATA POWER OUTPUT vs FREQUENCY 70 POWER OUTPUT RMS WATTS 60 50 40 30 20 10 0 10 100 1k 10k 100k FREQUENCY IN HERTZ INTERMODULATION DISTORTION vs POWER OUTPUT PERCENTAGE INTERMODULATION DISTORTION PERCENTAGE HARMONIC DISTORTION HARMONIC DISTORTION vs POWER OUTPUT 0.6 0.5 0.4 0.3 0.2 0.1 100 10 POWER OUTPUT IN RMS WATTS 8 20 Hz 2kHz 20kHz 0.6 0.5 0.4 0.3 0.2 0.
SPECIFICATIONS ELECTRICAL SPECIFICATIONS: POWER OUTPUT: STEREO— 50 RMS watts continuous per channel into 4, 8, or 16 ohms both channels operating. HARMONIC DISTORTION: STEREO—Less than 0.25% at 50 watts output from 20 Hz to 20 kHz both channels operating. Typical performance is less than 0.1% at rated power. Distortion decreases as output power is reduced. DAMPING FACTOR: 14 at 4 ohms output 27 at 8 ohms output 13 at 16 ohms output INPUT IMPEDANCE: 200,000 ohms INPUT SENSITIVITY: 0.5 volt.
POWER IF YOU'RE IN A HURRY OFF ON Turns the amplifier on/off. SPEAKER OFF ON Turns the speaker on / off. HEADPHONE To connect a set of low impedance stereo headphones. METER RANGE Adjust meter readings to power output level.
INSTALLATION Adequate ventilation extends the trouble-free life of electronic instruments. It is generally found that each 10° centigrade (18° F) rise in temperature reduces the life of electrical insulation by one half. Adequate ventilation is an inexpensive and effective means of preventing insulation breakdown that results from unnecessarliy high operating temperatures. The direct benefit of adequate ventilation is longer, trouble-free life. of the cabinet panel to be cut out for installation.
TYPICAL HOOK UP TUNER DIRECTIONAL FM A N T E N N A ROTATOR PREAMPLIFIER TO 117 V AC OUTLET AC LINE ALTERNATE SPEAKER LEAD CONNECTION TO BE U S E D WHEN PHASE S W I T C H AND PHONE J A C K ON C24 ARE TO BE USED.
CONNECTING THE MC2505 SPEAKER CONNECTIONS Use this table to determine proper speaker connection: Connect the If the speaker impedance speaker leads is between: between COM and: 3.2 to 6.5 ohms 4 ohms 6.5 to 13 ohms 8 ohms 13 to 26 ohms 16 ohms INPUT-STEREO The shielded cable from the left output of the Mclntosh preamplifier is plugged into the left jack. The shielded cable from the right output of the Mclntosh preamplifier is plugged into the right jack.
BLOCK DIAGRAM 14
OPERATING THE MC 2505 STEREO AMPLIFIER LEFT GAIN Use the left gain control to adjust the volume in the left channel to the desired listening level. Turn the control clockwise to increase the volume. RIGHT GAIN Use the right gain control to adjust the volume in the right channel to the desired listening level. Turn the control clockwise to increase the volume. METER RANGE The meter switch has four positions. The first position is off. With the switch in the OFF position there is no indication on the meters.
Your MC2505 stereo power amplifier will give you many years of pleasant and satisfactory performance. If you have any questions concerning operation or maintenance please contact the dealer from whom you purchased this instrument or: — CUSTOMER SERVICE GUARANTEE Mclntosh Laboratory Inc. 2 Chambers Street Binghamton, N. Y. 13903 Our telephone number is 607-723-3512 Mclntosh Laboratory Incorporated guarantees this equipment to be capable of performance as advertised.
MclNTOSH LABORATORY INC. 2 CHAMBERS ST., BINGHAMTON, N. Y. 13903 607-723-3512 Design subject to change without notice. Printed in U.S.A.
