STEREO MA51OO PRICE $1.
TECHNICAL DESCRIPTION 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. This is not required of ordinary equipment of average designs. It is, for us, a costly but worthwhile scientific and engineering effort.
GENERAL DESCRIPTION Conservative claims and specifications are traditional at Mclntosh. "Rated with honesty and conservatism . . ." "impressive performance figures . . ." "Highest quality of components and construction . . ." are the words used by independent experts when writing of Mclntosh. To assure you of highest performance every advertised claim is individually analyzed and verified by engineers using the most sophisticated and sensitive test instruments.
TECHNICAL DESCRIPTION PREAMPLIFIER SECTION The phono and tape head preamplifier circuits in the MA5100 have three transistors in each channel. The input selector switch connects the input jacks to the first voltage gain stage of the preamplifier. The input stage has high voltage gain and very low noise. The next stage, an emitter follower, acts as an impedance converter that matches the input stage to the second voltage amplifier. The emitter follower is direct coupled to the second voltage amplifier.
POWER AMPLIFIER SECTION There are 9 transistors in each power amplifier. The input stage is a pair of matched transistors arranged as an emitter coupled amplifier with two inputs and one output. The program from the preamplifier connects to one of the inputs, the second input is fed from the feedback loop that is around the power amplifier section. Both AC and DC feedback are used around the power amplifier section. Noise and distortion are reduced by the use of a large quantity of feedback.
BLOCK DIAGRAM 5
TYPICAL PERFORMANCE DATA 60 20 50 15 10 WATTS RMS 40 RESPONSE IN DB 5 POWER OUTPUT 0 -5 -10 -15 30 20 -20 10 20 100 1000 10000 0 20000 10 FREQUENCY IN HERTZ PERCENT INTERMODULATION DISTORTION PERCENT HARMONIC DISTORTION 10K 100K .6 .5 .4 .3 .2 .1 .5 .4 ,3 .2 .1 1 0 10 POWER OUTPUT IN WATTS RMS 6 1000 FREQUENCY IN HERTZ .
ELECTRICAL SPECIFICATIONS POWER OUTPUT: 45 RMS watts continuous per channel into 4 ohms both channels operating. 45 RMS watts continuous per channel into 8 ohms both channels operating. 30 RMS watts continuous per channel into 16 ohms both channels operating. HARMONIC DISTORTION: Less than 0.25% at rated power 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. INTERMODULATION DISTORTION: Less than 0.
INSTALLATION IN A CABINET To prepare the MA 5100 for installation remove the plastic protective covering. Turn the MA 5100 upside down so that it rests on its top on the shipping pallet. Remove the four plastic feet fastened to the bottom of the chassis. If the cutout is to be located from the rear of the panel, the following steps will help you. On the back of the cabinet panel, scribe a vertical centerline through the exact center of the area in which the cutout is to be made.
IF YOU'RE IN A HURRY INPUT SELECTOR 1 AUX ... for any device connected to the AUX inputs on back. TAPE ... for tape recorder with built-in electronics. TUNER ... for FM stereo or AM/FM tuner. PHONO 1 . . . for record player. PHONO 2 . . . for record player. TAPE HD ... for tape deck without electronics. 2 BASS . . . modifies low frequency sounds. Set to your taste. 3 TREBLE . . . modifies high frequency sounds. Set to your taste. 4 VOLUME . . . adjust to desired level. 5 BALANCE . . .
TYPICAL CONNECTION TUNER LEFT TAPE (WITH 10 RIGHT L O U D S P E A K E R LOUDSPEAKER RECORDER SELF CONTAINED E L E C T R O N I C S ) TV R E C O R D P L A Y E R 1I RECORD PLAYER 2 TAPE (NO SELF PLAYER CONTAINED ELECTRONICS)
CONNECTING A LOUDSPEAKER: The MA5100 is designed for stereo operation only. Do not connect the MA5100 for monophonic operation. Damage to the loudspeaker may result. Speakers are connected at the OUTPUT barrier strips on the back panel of the MA5100. LEFT RIGTH LOUDSPEAKER LOUDSPEAKER Connect the leads from the left loudspeaker to the LEFT OUTPUT barrier strip. Connect the leads from the right loudspeaker to the RIGHT OUTPUT barrier strip.
CONNECTING THE TAPE PLAYER: (A tape transport without electronics.) Plug the cable from the "left" tape head output on the tape transport into the upper TAPE HD jack on the MA 5100. Plug the cable from the "right" tape head output on the tape transport into the lower TAPE HD jack on the MA 5100. AC OUTLETS: There are 3 black AC outlets and one red AC outlet. The power to the black AC outlets is controlled by the front panel switch. Use these outlets for a tuner, tape recorder, etc.
LISTENING TO YOUR STEREO LISTENING TO A STEREO RECORD 1 Turn the INPUT SELECTOR to PHONO 1, or PHONO 2, whichever is connected to the record player you wish to hear. 2 Set the MODE SELECTOR to STEREO. 3 Adjust the VOLUME control to desired volume. LISTENING TO MONOPHONIC RECORDS 1 Turn the INPUT SELECTOR to PHONO 1, or PHONO 2, whichever is connected to the record player you wish to hear. 2 Turn the MODE SELECTOR to MONO. 3 Adjust the VOLUME control to the desired volume.
USING THE FRONT PANEL CONTROLS INPUT SELECTOR: Selects any one of six program sources: AUX: Any high level program source requiring flat amplification, such as a television set, is connected to the input stage of the MA5100 in the AUX position. TAPE: Any self-contained tape machine (tape machine having its own playback preamplifier) is connected to the high level input stage of the MA 5100 in the TAPE position.
L + R TO R: connects the "left plus right" programs to the "right" loudspeaker only. COMP (COMPENSATION): Use the COMP switch to correct for phono equalization introduced in the recording process. All current stereo recordings use RIAA equalization. Some early stereo and mono recordings use LP equalization. TAPE: The TAPE switch makes it possible to instantaneously compare recorded material with the signal source.
GUARANTEE Mclntosh Laboratory Incorporated guarantees this instrument to be capable of performance as advertised. We also guarantee the mechanical and electrical workmanship and components to be free of defects for a period of 90 days from date of purchase. If such defects occur, Mclntosh Laboratory or one of its authorized agencies will repair the defect at no cost to the purchaser.
MclNTOSH LABORATORY INC. 2 CHAMBERS ST., BINGHAMTON, N. Y. 13903 607-723-3512 Design subject to change without notice. Printed in U.S.A.
