Related Manuals for McIntosh MA230
Summary of Contents for McIntosh MA230
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Page 1: Table Of Contents
MA230 STEREO PREAMP-AMPLIFIER GENERAL DESCRIPTION TECHNICAL DESCRIPTION Mechanical Specifications Electrical Specifications FRONT PANEL INFORMATION INSTALLATION CONNECTIONS TABLE OF CONTENTS AC Connections Ground Connection Tape Output Connections Loudspeaker Connections AC Power Input Connections OPERATING INSTRUCTIONS GUARANTEE 3-YEAR FACTORY SERVICE CONTRACT... -
Page 3: General Description
. . . The MA230 is the FIRST stereo pre- audio frequencies. amp-amplifier on one chassis that meets the Long life, flexibility, and highest quality... - Page 4 The the MA230 without loss of low frequencies. entire preamplifier has low noise, low distor- The emitter-follower provides the required tion, and is not affected by normal room temperature variations.
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Page 5: Mechanical Specifications
Again, Mclntosh care in engineering protects in normal use. To assure best possible per- your investment in listening pleasure. formance of the MA230 over long periods of The combination of these features results operation, or whenever output tubes are in performance available only from a Mc- changed, the bias can be checked and reset lntosh amplifier. - Page 6 Tape Switch Frequency Range Normal or Tape Monitor. At 30 watts output both channels. + 0, -0.5db 20 cycles through 20,000 Phase Switch cycles. Normal (0°) or reverse (180°). +0, - 3 d b 15 cycles through 70,000 Speaker Switch cycles.
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Page 7: Front Panel Information
FRONT PANEL INFORMATION Figure 1. MA230 Front Panel. 6. TAPE HD: Use the TAPE HD (Tape INPUT SELECTOR Head) position for a tape deck that does not have its own playback preamplifier. The Tape Head leads are connected to the back panel TAPE HD input jacks. - Page 8 Turn the MODE SELECTOR to: Use the MA230 BALANCE control to bal- ance unequal volume in the left and right 1. L TO L & R: connects the "left" input to channels of a program source. The volume both loudspeakers.
- Page 9 The MA230 TAPE switch makes it possible to instantaneously compare recorded ma- terial with the source signal. Use the MA230 TAPE switch to know instantaneously, as you are recording, that the music on the tape is acceptable. Tape monitor jacks on the back panel accept a signal from a tape recorder with a monitor head and preamplifier.
- Page 10 HEAD PHONE HEAD PHONE Two pairs of low impedance stereo head- Use the HF filter to minimize surface noise phones can be connected to the MA230. when reproducing old or badly worn record- Both front panel headphone jacks are con- ings.
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Page 11: Installation
So that front of the cabinet into the panel cutout. the MA230 will rest on the cabinet shelf, fol- Two amplifier mounting brackets are pro- vided for each side of the cabinet panel open- low these instructions carefully. - Page 12 6. Left and right metal mounting brackets are packed with the MA230. Fasten these two Figure 19. Installation Cutout. mounting brackets to the cabinet panel using 5. Secure the mounting strips to the in- four of the fillister head screws.
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Page 13: Connections
AC CONNECTIONS There are three AC outlets on the back changer. The red receptacle is not switched panel of the MA230. The black receptacles to prevent turning off the power to the turn- have a maximum power rating of 350 watts table while its idler drive is still engaged. -
Page 14: Tape Output Connections
AC POWER Plug the AC power cord into a 120-125 adjustments are made at the tape recorder. The room listening volume of the MA230 can volt, 50 or 60 cycle power line. INPUT CONNECTIONS The MA230 provides seven separate pro- TOR switch. - Page 15 DIRECTIONAL FM ANTENNA ROTATOR GROUND TO 12OV AC OUTLET 8 OHM SPEAKERS SHOWN...
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Page 16: Operating Instructions
R and the L+R to L positions. Adjust the The control marked BALANCE on the MA230 BALANCE control until the loud- MA230 can be used to perfectly balance all speaker volumes are equal. factors for best listening. The stereo system will now be balanced. - Page 17 source of sound should appear to be directly tone balance without introducing any unde- in front of you. Alternate the PHASE switch sirable effects. Do not be surprised if you between 0° and 180°. If the sound is not di- find your preference in tone changing from rectly in front of you in the 0°...
- Page 18 (See page 15 ADJUSTING FOR SPECIAL 2. Turn the MODE SELECTOR to MONO EFFECTS.) (L+R) or STEREO, depending on the pro- 5. Set the LF filter switch to FLAT. (See gram on the tape. page 15 ADJUSTING FOR SPECIAL EF- 3.
- Page 19 1. Set the TAPE MONITOR switch to The POWER ON-OFF switch controls the MONITOR. AC power to the MA230 and the two black AC 2. Turn the MODE SELECTOR switch to receptacles on the back panel. The red AC receptacle is not switched, and is on at all MONO (L+R).
- Page 20 BASS AND TREBLE CONTROL RESPONSE - 2 0 10KC 20KC FREQUENCY RUMBLE AND HIGH FREQUENCY FILTERS 10KC 20KC FREQUENCY...
- Page 21 LOUDNESS CONTROL - 1 0 - 2 0 10KC 2 0 K C FREQUENCY EQUALIZATION CURVES 10 KC 2 0 KC FREQUENCY...
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Page 22: Guarantee
Your Mclntosh MA230 tuner will give you many years of pleasant and satisfactory performance. If you have any questions concern- ing the operation or maintenance of this tuner please contact: Customer Service Mclntosh Laboratory Inc. 2 Chambers Street Binghamton, New York Our telephone number is 723-5491. - Page 24 LABORATORY INC. 2 CHAMBERS STREET, BINGHAMTON, N. Y. Mods in U.S.A. Phone-Area Code 607-723-5491 AA133-183 BE122003...