User manual SHURE M64A

[. . . ] In addition, the preamp can be used without equalization for a microphone input or as a buffer amplifier. Typical Applications Permits turntable to be used with PA mixers and amplifiers without phono inputs Converting stereo record pickup systems from ceramic to magnetic cartridges Microphone preamplifier Low-gain buffer amplifier (where long cable lengths are extended to a preamp input) The M64A has a single three-position slide switch for selecting Phono, Tape or Flat frequency compensation. The Phono position provides the standard RIAA equalization for phonograph records. In this mode, magnetic phono cartridges can operate into auxiliary level inputs, inputs without RIAA equalization, or ceramic phono cartridge inputs. [. . . ] This automatically selects the proper equalization (frequency response) for both channels. For the equalized Phono (RIAA) or Tape (NARTB) positions, connect the signal leads from the phono cartridge or tape head to the M64A jacks marked Channel 1 lnput and Channel 2 Input. Note that the Flat position can be used for phono cartridge or tape head buffering applications in which the M64A output is connected to an equalized amplifier input. For the Flat position using two high-impedance microphones, connect each microphone cable to one of the M64A lnput connectors. If a single highimpedance microphone is used, connect it to either lnput connector. NOTE: If low-impedance microphones are to be used, a suitable line matching transformer such as Shure's A95 Series should be used. + 1O0/0, 50160 Hz (internally selec- Temperature Range Operating: -7" to 57" C (20" to 135" F) Storage: -29" to 71 " C (-20" to 160" F) Dimensions See Figure 2 Net Weight 986 grams (1 Ib 2-112 oz) r ( 5 - 9 / 144mm 1 6 IN. ) 1 104mm (4-3/32 I N . I ~ 4. Refer to the phono cartridge, tape head or microphone data sheet for details on connections, phasing and grounding. Connect the Channel 1 and Channel 2 Output jacks (High or Low Level) to the corresponding input jacks of the power amplifier, preamplifier, tape recorder or mixer. The High Level outputs can be connected to high-level auxiliary inputs, and the Low Level outputs can be connected to low-level microphone inputs (or equalized phono or tape head inputs in buffering applications). OVERALL DIMENSIONS FIGURE 2 INSTALLATION 6. If grounding is necessary, the associated equipment ground lead can be attached to the M64A Ground screw. Insert the M64A power line cord into a proper power outlet (120 Vac + l o % , 50160 Hz), preferably one controlled by the power amplifier's on-off switch. Make certain the M64A Power switch is turned on if the unit is to be remotely turned on and off. To reduce the risk of fire or electric shock, do not expose this appliance to rain or extreme moisture. The M64A can be operated on any flat surface, or (with adequate space) be mounted to an amplifier chassis or cabinet using screws through the M64A's mounting flanges. The unit can be mounted in any position for normal operation, but for best results, it should be located away from motors, lighting dimmers, or other hum-producing power sources and away from intense heat sources. Should hum be encountered in a sound system or installation, one or more of the equipment power plugs may be reversed to reduce hum. If the turntable has a grounding lead, this wire can be connected to the M64A Ground screw to reduce hum pickup. SERVICE WARNING Voltages in this equipment are hazardous to life. Refer servicing to qualified service personnel. Balanced Line Output For professional low-impedance balanced-line use such as broadcast systems or recording consoles, an external line matching transformer such as Shure's A95 Series can be added to each M64A High Level output. The resultant output level is approximately -32 dBm. If 2 a higher output is required (-20 dBm), the following modification can be made to increase the output level by approximately 12 dB. [. . . ] If the M64A is to be used outside the U. S. and Canada, local regulations may require replacing the line cord with one having wire insulation colors as follows: "Live" or "Hot" Neutral Earth or Ground U. S. , Canada Black White Green Europe Brown GreenlYellow Blue 5. Replace the top cover and mark the rear panel to reflect the new operating voltage. Gain 3 dB 6 dB 9 dB Resistor 2. 2k lk 560 ohms PRINTED CIRCUIT BOARDS COMPONENT SIDE M-64 TOP SILK REPLACEMENT PARTS LIST REFERENCE DESCRIPTION C1 C2-C3 C8-C9 C14-C15 C16-C17 C24 C26 D l -D2 J1 J2 Q1-Q2 Q3-Q4 R1 R3-R4 R5-R6 R13-R14 S1 S2 S3 TI W1 DESCRIPTION Capacitor, Electrolytic, 22 pF, 35V Capacitor, Electrolytic, 4. 7 pF, 25V Capacitor, Electrolytic, 100 pF, 25V Capacitor, Electrolytic, 4. 7 pF, 35V Capacitor, Electrolytic, 47 pF, 16V Capacitor, Electrolytic, 220 pF, 50V Capacitor, Electrolytic, 470 pF, 50V Diode, Silicon Rectifier, 100V, 112A Connector Assembly, Input Connector Assembly, Output Transistor, Silicon, NPN Transistor, Silicon, PNP Resistor, Metal Oxide, 1. 3k, 112W Resistor, Metal Film, 68k, 1/4W, 1% Resistor, Metal Film, 180k, 114W, 1% Resistor, Metal Film, l k , 114W, 1% Switch, Slide, DP3T, Equalizer Switch, Slide, DPDT, Power Switch, Slide, DPDT, Voltage Selector Transformer, Power Line Cord, Ac, 3-Conductor, 2. 1 m (7 ft) COMMERCIAL ALTERNATE Sprague 503D226F035MB Nichicon UKBl E4R7KAA Nichicon UKBl H100KAA Sprague 503D475F035KA Mallory VTL-47S16 Mal lory VTL-220S50 Mallory VTL-470S50 Shure RKC21*, Motorola 1N4002 None None None* None* RCA 830047 TRWllRC TO-60 TRWllRC TO-60 TRWllRC TO-60 None None Switchcraft 46206LFR None Shure 95A8015 I Parts listed as "None" should be ordered from Shure Brothers Inc. listing product model number, reference designation, and part description. 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