MA-300 Manual - Mojave Audio
Contents
1. E PURCHASED FROM 2711 Empire Street Burbank CA 91504 e tel 818 847 0222 e www mojaveaudio com2. En d audio MA 300 Multi pattern Vacuum Tube Condenser Microphone Please visit www mojaveaudio com for more information including e Recording Tips e FAQ s e Warranty Registration e Customer Service CONTENTS INTRODUCTION aso GG da 2 UNPACKING AND INSPECTION use 2 GENERAC INFORMATION sidad ia ada 3 SAFETY INSTRUCTIONS acia 3 OPERA MON aeee i lca ORA E A E E ra 4 CARE OF YOUR MICROPHONE see een 5 TECHNICAL SPECIFICATIONS uns een 6 POLAR RESPONSE 00 7 FREQUENCY RESPONSP rana ias 7 POLAR PATTERN SELECTOR saa AE AGA laa 8 BASS CUTSWITO iii 8 150B PAD ii u A A AAA ASA AA 8 WARRANT Y ai 9 INTRODUCTION Congratulations on your purchase of a Mojave Audio MA 300 Multi pattern Vacuum Tube Condenser Microphone Your MA 300 was carefully designed and constructed using only the finest materials The MA 300 microphone is capable of delivering superb performance and with minimal care will do so for many years Your MA 300 was thoroughly tested and given a 24 hour factory burn in prior to shipment The MA 300 s capacitor capsule and electronics are adapted from mid 1950 s design practice The MA 300 utilizes a U S made military grade low noise sub miniature vacuum tube and a Jensen audio output transformer By utilizing modern components the microphone system emulates the performance of classic tube microphones without using esoteric unreliable or hard to find components The MA 300 is guaranteed to perform as specified a
3. ave attenuation below 100Hz when engaged This is very useful in removing unwanted low frequency information such as rumble or bass build up due to proximity effect Experienced engineers know that it is a good practice to filter out low frequencies when it does not affect the audible sound A good example of this would be recording vocals Most singers do not have much information below 100Hz so engaging a filter will help maintain the integrity of the signal 15dB PAD The 15dB reduces the signal before the head amplifier in the microphone This is very useful for recording high SPL signals If you are experiencing distortion engaging the pad will likely be the solution Also if you have the gain on your mic preamp all the way down and the signal is still overdriving your signal path engaging the pad would be indicated WARRANTY Your Mojave Audio product is warranted to the original owner for a period of two years Mojave Audio guarantees this product to be free from electrical and mechanical defects and will repair or replace defective components or replace the microphone at Mojave Audio s option Should service be required for your Mojave Audio product please contact the manufacturer Excellent service will also be provided for products beyond the warranty period at a modest cost for parts and labor Please visit mojaveaudio com for the latest updates and technical information MODEL NUMBER SERIAL NUMBER DATE OF PURCHAS
4. ctice to examine the power cord regularly Never use a cord that shows damage or that has exposed wires There are no user serviceable components inside the MA 300 microphone or its power supply Always refer service to a qualified technician equipped to service this equipment Never expose the MA 300 microphone its power supply or cable set to water or any environment that may create an electrical hazard In the event of a malfunction disconnect the MA 300 immediately and determine the nature of the malfunction before attempting to use it again To avoid tripping over the microphone cable make certain that the cable is not in the way of foot traffic or suspended in an unsafe manner Make sure that the microphone stand is secure and not likely to fall If you have any questions or concerns about operation of your MA 300 please contact the factory info mojaveaudio com OPERATION When plugging the microphone in the seven pin XLR connectors between the microphone and the power supply should be inserted gently into their corresponding sockets Rough handling misaligned orientation or trying to force the connections together too quickly could result in bent pins Operation Tip Your MA 300 was thoroughly checked and burned in before leaving the factory Before using it for the first time we recommend connecting the MA 300 to its power supply and letting it warm up for at least thirty minutes Moisture build up on the capsule or on th
5. e other high impedance components within the microphone can cause random noise or static The thirty minute initial warm up will drive out any residual moisture that may have collected on the internal components during shipping or storage Also note that if the MA 300 is being used with phantom powered microphones in a multiple microphone setup phantom power may be applied to the channel connected to the MA 300 without ill effect provided that your standard 3 pin microphone cables are wired properly A grounded power cord is used to connect the power supply to an electrical socket MA 300 power supplies are shipped pre wired for standard AC voltage in the country where the microphone is sold If there is a need to change AC voltage travel sale to another country etc an external switch allows the power supply to be configured for 100 115 or 230 volts at either 50 or 60 Hz Make sure the fuse is the proper value 500 mA for 100 120 Volts AC and 250 mA for 230 Volts AC Hot plugging any vacuum tube microphone can damage the microphone s electronics so always be sure to connect the microphone to the power supply with its multi conductor cable before turning the power supply on AC LINE FUSE A spare fuse is included with your MA 300 power supply It is located in the fuse carrier just above the AC receptacle To access the fuse gently pry out the carrier with a flat bladed screwdriver The fuse is mounted in the clip and the spare is locat
6. ed is a small channel behind the cover Replace the fuse with the same type as supplied with your microphone MAINS VOLTAGE FUSE TYPE 100 Volts AC T500mAL 120 Volts AC T500mAL 220 Volts AC T250mAL In the rare event that you experience fuse failure identify the cause of the failure before using the microphone again The most common cause for a fuse to fail would be a damaged microphone cable or a broken or bent pin on a connector The next most likely cause for fuse failure is operation of the power supply on incorrect voltage CARE OF YOUR MICROPHONE Your microphone is a delicate precision instrument and it should be treated as such Here are some commonsense rules to keep your microphone healthy l Be careful in your setup so that the microphone and or power supply never falls to the floor Never suspend the microphone by its cable and be sure to position the cable so that it cannot be tripped over Falls to the floor have been the ruin of many a microphone NEVER hot plug the microphone i e plug the microphone into an energized power supply as the resulting voltage surges can damage the microphone s or following preamplifier s electronics Keep the microphone cable and power supply in a safe place such as its carrying case or a microphone locker when not in use When plugging in the seven pin cable between the microphone and power supply orient the plug correctly and plug the connectors in gently Rough handling
7. h the microphone along with a specially designed shock mount assembly The capsule is a 3 micron dual membrane gold sputtered type The vacuum tube head amplifier delivers wide bandwidth and low noise operation The MA 300 utilizes a sub miniature vacuum tube which necessitates the need for a dedicated power supply The vacuum tube is military grade 5840W new old stock and will deliver excellent performance for many years A specially designed high quality Jensen audio output transformer delivers an isolated truly balanced output signal minimizing the possibility of unwanted noise entering the preamplifier As with all vacuum tube microphones a warm up period is advised for optimum performance usually about ten minutes The MA 300 includes a 15dB pad and a bass cut switch SAFETY INSTRUCTIONS WARNING To avoid electrical shock to yourself and damage to the MA 300 use proper circuit protection MA 300s purchased in the USA are set for 120V 60 Hz operation MA 300s purchased outside of the USA are set for the voltages of the country to which they are exported This information is duly noted on the outside of the shipping box as well as on voltage selector of the power supply The MA 300 uses a line fuse for protection Never replace this fuse with one of a higher current rating Use only that type which was supplied with the unit The power supply cord that is supplied with your MA 300 is a standard business machine type It is a good pra
8. hone 7 5 8 X 2 1 Ib 13 5 lbs 100 115 or 220 240 volts AC at 50 or 60 Hz Power consumption approximately 10 watts POLAR RESPONSE Type Multi pattern FREQUENCY RESPONSE 20Hz 20kHz 2 5dB POLAR PATTERN SELECTOR The continuously variable polar pattern selector is a rotary knob found on the front panel of the power supply The selector allows the user to choose omnidirectional cardioid and figure eight patterns or a point in between Omnidirectional rotate fully counterclockwise An omnidirectional polar pattern covers all directions and picks up all sound in a 360 degree radius Useful for natural ambient sound Cardioid 12 o clock position Cardioid microphones pick up sound within 120 degrees of the direction they are facing Useful for capturing one sound with a minimum of ambiance Figure Eight rotate fully clockwise Figure of Eight bi directional microphones pick up sound from the front and rear while rejecting sound from the sides Occasionally a point in between will yield the most favorable result For example setting the selector to a 2 o clock position can be an especially pleasant pattern for recording vocals Also for close miking of an acoustic guitar in cardioid rotating the selector towards omni counterclockwise can reduce excessive proximity effect unwanted bass buildup BASS CUT SWITCH The bass cut switch also known as a hi pass filter provides a 6dB per oct
9. nd is suitable for recording even the most demanding music provided that the microphone is used sensibly For optimum performance from your microphone please read this manual thoroughly and familiarize yourself with the proper use of the MA 300 UNPACKING AND INSPECTION Carefully unpack your MA 300 and verify that all of the accessories included with the microphone are accounted for Do not discard any packing materials If anything is missing or damaged contact your dealer or Mojave Audio immediately Items included with the MA 300 are MA 300 microphone inside an aluminum style carrying case AC operated microphone power supply 16 foot microphone cable with 7 pin male and female connectors MA 300 shock mount and European adapter fitted to shock mount AC power cable for power supply molded IEC business machine type with plug Rugged carrying case for all above items Ou Bu D Verify that the serial number of your MA 300 matches correctly with the one on your receipt The MA 300 serial number can be found inside the microphone housing To access simply unscrew the bottom ring and slide the body off When corresponding with Mojave Audio about your microphone or when service is required we will need to know the serial number so keep it handy GENERAL INFORMATION The MA 300 is a multi pattern vacuum tube microphone and requires a dedicated power supply and seven pin cable set for operation These items are provided wit
10. or hurry up plug ins can result in bent or broken pins Never connect the power supply to an AC power outlet that has different voltage than what the power supply is set for Do not expose the microphone to dusty smoky or humid environments Any repairs must be performed by a qualified technician There are no user serviceable parts in the MA 300 Use a soft lint free cloth to remove fingerprints and other blemishes on the microphone body Never use chemicals solvents or detergents TECHNICAL SPECIFICATIONS TRANSDUCER TYPE DIAPHRAGM DIAPHRAGM THICKNESS POLAR PATTERN FREQUENCY RESPONSE SENSITIVITY MAXIMUM SPL DISTORTION SELF NOISE IMPEDANCE VACUUM TUBE DIMENSIONS AND WEIGHT SHIPPING WEIGHT POWER REQUIREMENTS Externally polarized pressure gradient capacitor dual membrane 1 inch diameter gold sputtered 3 micron Multi pattern continuously variable from omnidirectional to figure eight 20 Hz 20kHz 3dB at Flat setting Bass cut switch provides 6dB per octave attenuation below 100Hz in cut setting 37 dB re 1V pa 120 dB 135dB with pad on lt 1 117dB SPL lt 3 125dB SPL with pad off lt 1 132 dB SPL lt 3 140dB SPL with pad on 14dB nominal not to exceed 16dB A weighted 200 ohms transformer balanced 5840 pentode tube wired for triode operation Carrying case with microphone power supply shock mount and cables 13 Ibs Microp
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