User manual MCINTOSH MC2505

[. . . ] PRICE $1. 25 MC25O5 SOLID STATE STEREO POWER AMPLIFIER MC2505 CONTENTS TECHNICAL DESCRIPTION LOCKING METERS P E R F O R M A N C E CHARTS CHARTS SPECIFICATIONS IN A HURRY INSTALLATION TYPICAL HOOKUP CONNECTING BLOCK DIAGRAM OPERATING GUARANTEE 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. This requires a constant and relentless search for low noise, broad band conservative design with an ever lower distortion factor. It is, for us, a costly but worthwhile scientific and engineering effort. Our continuing research benefits our customers with the almost complete lack of obsolescence and the most reliable equipment ever made. [. . . ] Adjust the record volume only on the 1000 Hz signal for proper recording level. A comparison of the two curves will give the recording characteristics of your tape recorder. Similar checks can be made on all program sources in your stereo system. Follow the same general procedure for any program source for which a standard reference is available. Follow these steps to plot the performance of your phonograph cartridge. Play the 1000 Hz test tone recorded on the CBS Test Record STR100 on your phonograph. Turn the "LEFT GAIN" control until the left meter indicates "0. " 4. Turn the "RIGHT GAIN" control until the right meter indicates "O. " 5. Write down the meter indication at each frequency as the record plays. The graph shows the ideal RIAA response curve using the CBS #STR100 test record. By making this check at regular intervals, (for instance, every 6 months) any deterioration in the cartridge or system will be quickly detected. IDEAL RIAA SYSTEM RESPONSE USING CBS STR 100 TEST RECORD 4 2 0 -2 -4 -6 -8 -10 R E L A T I V E OUTPUT LEVEL IN dB -12 14 -16 -13 -20 20 100 1k 10k 20k FREQUENCY IN Hz IDEAL RIAA SYSTEM RESPONSE USING CBS STR 100 TEST RECORD 4 2 0 -2 -4 -6 -8 -10 RELATIVE OUTPUT LEVEL IN dB 12 -14 -16 -18 -20 5 20 100 1k 10k 20k FREQUENCY IN Hz IDEAL RIAA SYSTEM RESPONSE USING CBS STR 100 TEST RECORD 4 2 6 0 -2 -4 -6 -8 -10 RELATIVE OUTPUT LEVEL IN dB -12 -14 -16 -18 -20 20 100 1k 10k 20k FREQUENCY IN Hz IDEAL RIAA SYSTEM RESPONSE USING CBS STR 100 TEST RECORD 4 2 0 -2 -4 -6 -8 -10 RELATIVE OUTPUT LEVEL IN dB -12 -14 -16 -18 -20 20 100 1k 100k FREQUENCY IN Hz 20k 7 TYPICAL PERFORMANCE DATA 70 POWER OUTPUT vs FREQUENCY 60 POWER OUTPUT RMS WATTS 50 40 30 20 10 0 10 100 1k 10k 100k FREQUENCY IN HERTZ HARMONIC DISTORTION vs POWER OUTPUT PERCENTAGE INTERMODULATION DISTORTION INTERMODULATION DISTORTION vs POWER OUTPUT PERCENTAGE HARMONIC DISTORTION 0. 6 0. 6 0. 5 0. 5 0. 4 0. 4 0. 3 0. 3 0. 2 0. 2 0. 1 0. 1 10 POWER OUTPUT IN RMS WATTS 100 20 Hz 2kHz 20kHz 10 POWER OUTPUT IN EQUIVALENT RMS WATTS 100 8 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. INTERMODULATION DISTORTION: STEREO--Less than 0. 25% if instantaneous peak power output is 100 watts or less per channel with both channels operating for any combination of frequencies 20 Hz to 20 kHz. 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 REQUIREMENTS: 117 volts AC 50/60 Hz, 75 watts at zero signal output. 27 silicon rectifiers and diodes. FREQUENCY RANGE: 20 Hz to 29kHz +0, -0. 1 dB at rated power. OUTPUT IMPEDANCE: STEREO--4, 8, and 16 ohms MECHANICAL SPECIFICATIONS: SIZE: 5-7/16 inches high, 16 inches wide, 13 inches deep. WEIGHT: 38 pounds net, 53 pounds in shipping carton. SPECIAL FEATURES The amplifier is completely stable when connected to any loudspeaker system or even to any reactive loads. The MC 2505 has special circuits to prevent damage by short circuit or open circuit of the output loads, or by any amount of output impedance mismatch. Make sure that there is at least ¼ inch clearance between the bottom of the dashed line of the cutout area on the template and any shelf or brace below the proposed cutout. Mark the two locating holes ("C" holes on the mounting template). Now position the template on the front of the panel by aligning the "C" locating holes on the template with the drill holes. With the template in place against the cabinet panel, mark the "A" and "B" drill holes and the four small holes that identify corners of the cutout. IMPORTANT: DRILL THE 6 HOLES BEFORE MAKING THE CUTOUT Accurately drill the three holes on each side of the cutout area with a 3/16 inch drill. [. . . ] Connect as follows: Connect one left speaker to screw LEFT-COM and other to: LEFT-4 LEFT-8 LEFT-16 Connect one right speaker lead to the screw marked RIGHT-COM and the other to: RlGHT-4 RIGHT-8 RlGHT-16 If the speaker impedance is: 4 ohms 8 ohms 16 ohms DO NOT CONNECT A MONOPHONIC LOUDSPEAKER TO BOTH TERMINALS. THE LOUDSPEAKER CAN BE DAMAGED. For 25 volt line operation connect one of the left leads to the screw marked COM on the LEFT OUTPUT barrier strip. The other left lead is connected to the screw marked 16 on the LEFT OUTPUT barrier strip. Connect the right leads in the same manner on the RIGHT OUTPUT barrier strip. [. . . ]