Mchugh Military AMM-68 Instruction Manual
MCHUGH MILITA RY C O R P.
- INSTRUCTION MANUAL -
MCHUGH MILITARY CONDENSER MICROPHONE
MODEL AMM-68
MCHUGH MILITA RY C O R P O R AT I O N
COSTA MESA, CA U S A
TM - .875
The 3rd edition
Februray, 1984
MCHUGH MILITA RY C O R P.
- INSTRUCTION MANUAL -
MCHUGH MILITARY CONDENSER MICROPHONE
MODEL AMM-68
TM - .875
MCHUGH MILITA RY C O R P O R AT I O N
COSTA MESA, CA U S A
The 3rd edition
Februray, 1984
MCHUGH MILITA RY C O R P.
MCHUGH MILITARY CONDENSER MICROPHONEMODEL AMM-68
1. General
The MCHUGH MILITARY CONDENSER MICROPHONE MODEL AMM-68 is a high fi del
ity, omni-directional microphone developed by McHugh Military engineer-
ing staff.
The excellent performance of the AMM-68 got great reputation in the en-
tire fi eld of acoustic concern when it was introduced, and it has been
used in world-wide broadcasting stations, fi lm studios, recording facili-
ties, etc., where superior characteristics and reliability is required,
owing to its stable function, excellent performance, simple operation and
rigid construction.
2. Description
2. Description
2.1. The upper part of the microphone is a 19 mm capsule
mounted in the metal netting, and the lower part,
inside of the metal case, is a cathode-follower circuit incl-
duing an electron tube 5840. the entire internal assembly is
rigidly shielded against an external static fi eld.
The diaphragm of the microphone capsule is a very thin plastic
fi lm nickel plated. Since this diaphragm is mounted on the capsule so
that it may fet full damping effect accoustically, the condenser mi-
crophone model AMM-68 shows very excellent frequency perfor-
mance.
2.2. The microphone unit is connected to the POWER SUPPLY MODEL MM-312
through the MICROPHONE CABLE TYPE BLDN-5P.
The output signal from the AMM-68 is delivered from the connector
located on the side panel of the CP-3B.
2.3. The new power supply unit model MM-312 is an improved version
of the model MM-31 formerly used, providing more reliable components
and printed circuit construction for higher and uniform performance.
2.4. Connectors for input and output, selectors for frequency response
are provided on the front panel of the MM-312.
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MCHUGH MILITA RY C O R P.
MCHUGH MILITARY CONDENSER MICROPHONEMODEL AMM-68
1. General
The MCHUGH MILITARY CONDENSER MICROPHONE MODEL AMM-68 is a high fi del
ity, omni-directional microphone developed by McHugh Military engineer-
ing staff.
The excellent performance of the AMM-68 got great reputation in the en-
tire fi eld of acoustic concern when it was introduced, and it has been
used in world-wide broadcasting stations, fi lm studios, recording facili-
ties, etc., where superior characteristics and reliability is required,
owing to its stable function, excellent performance, simple operation and
rigid construction.
2. Description
2.1. The upper part of the microphone is a 19 mm capsule
mounted in the metal netting, and the lower part,
inside of the metal case, is a cathode-follower circuit incl-
duing an electron tube 5840. the entire internal assembly is
rigidly shielded against an external static fi eld.
The diaphragm of the microphone capsule is a very thin plastic
fi lm nickel plated. Since this diaphragm is mounted on the capsule so
that it may fet full damping effect accoustically, the condenser mi-
crophone model AMM-68 shows very excellent frequency perfor-
mance.
2.2. The microphone unit is connected to the POWER SUPPLY MODEL MM-312
through the MICROPHONE CABLE TYPE BLDN-5P.
The output signal from the AMM-68 is delivered from the connector
located on the side panel of the CP-3B.
2.3. The new power supply unit model MM-312 is an improved version
of the model MM-31 formerly used, providing more reliable components
and printed circuit construction for higher and uniform performance.
2.4. Connectors for input and output, selectors for frequency response
are provided on the front panel of the MM-312.
- 1 -
MCHUGH MILITA RY C O R P.
3. Specifi cations
3. Specifi cations
3.1. Type: Condenser microphone.
3.2. Output impedance: 150 ohms, balanced, deviation
20%
3.3. Microphone cable: Shielded 4 conductors cable with
connectors type 5P, length 5.4 meters
3.4. Output receptacle: Type 3P.
3.5. Finish: Microphone - 6061 brushed aluminum
Power supply - Mil. Spec. green enamel.
3.6. Tube: 5840
3.7. Dimensions: Refer to fi g. 1 and 2.
3.8. Weights: Microphone - 91.7 g,
Power supply - 2.21 kg.
Microphone Cable - 390.5 g.
Total Weight - 3.29 kg.
3.9. Power requirements: AC 117 volts
60 cps, 10 VA
3.10. Power cable: 1.8 meter length UL cord.
Weight - 148 g.
4.1. Directivity: Omni-directional - refer to fi g. 3.
4.2. Frequency response: Omni-directional - refer to fi g. 4
Frequency range: 30 - 10,000 cps
within 5 db.
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MCHUGH MILITA RY C O R P.
3. Specifi cations
3.1. Type: Condenser microphone.
3.2. Output impedance: 150 ohms, balanced, deviation + 20%
3.3. Microphone cable: Shielded 4 conductors cable with
connectors type 5P, length 5.4 meters
3.4. Output receptacle: Type 3P.
3.5. Finish: Microphone - 6061 brushed aluminum
Power supply - Mil. Spec. green enamel.
3.6. Tube: 5840
3.7. Dimensions: Refer to fi g. 1 and 2.
3.8. Weights: Microphone - 91.7 g,
Power supply - 2.21 kg.
Microphone Cable - 390.5 g.
Total Weight - 3.29 kg.
3.9. Power requirements: AC 117 volts
60 cps, 10 VA
3.10. Power cable: 1.8 meter length UL cord.
Weight - 148 g.
4. Performance characteristic
4.1. Directivity: Omni-directional - refer to fi g. 3.
4.2. Frequency response: Omni-directional - refer to fi g. 4
Frequency range: 30 - 10,000 cps
within 5 db.
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