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AA
AUDiO ALTO
Dual mono integrated hybrid amplifier
Model DMI 3 H
User Manual
WITHIN THE BEAUTY OF SOUND
Version 1.0
Page 1: ...www audioalto com info audioalto com AA AUDiO ALTO Dual mono integrated hybrid amplifier Model DMI 3 H User Manual WITHIN THE BEAUTY OF SOUND Version 1 0 ...
Page 2: ...magnetic field Part of this voltage which holds mostly unpleasant information of the speaker box and ambient reflections is projected through GNFB to the input of the power amplifier In reality this induced voltage should must be ignored and shouldn t be re amplified again and transferred back to the speaker generating new induced voltage that returns back to the amplifier input and so on Using GN...
Page 3: ...ntegrated amplifier These approaches give the AA DMI 3 H a remarkably natural detailed open reproduction and provide great stage sound This brief operating manual contains important information regarding the operation and care of the amplifier so be sure to read this manual carefully and follow these simple instructions in order to keep it looking operating and sounding its best ...
Page 4: ...ny 6 Power Cord Protection Power supply cords should be routed so that they are not likely to be walked on or pinched Pay particular attention to cords at plugs convenience receptacles and where they exit from the product Always use power cords with adequate current ratings and safety certifications UL CE TÜV CSA etc 7 Fuses For continued protection against fire hazard replace fuses with the same ...
Page 5: ...hould be removed by qualified personnel only The tubes have 6 month warranty Handling We suggest that you do not handle the tubes with your bare hands or fingers as skin oils deposited on the glass surface can leach through the glass envelope and cause the tube to become gassy In other words your tube life may be shortened unnecessarily Use a paper towel or one of the cotton gloves supplied instea...
Page 6: ... and circuits are doubled dual mono the voltages are regulated and are time and amplitude delayed for smoother power up thus protecting the vacuum tube The tube heater voltage starts at 1V and gradually in 6 seconds reaches the nominal amplitude of 6 3V As the tube gets hot the high voltage starts to gradually rise from 0V up to the nominal amplitude it takes around 120 seconds to reach the requir...
Page 7: ...dered and installed separately The circuit topology compared to widely used circuits is innovative with two amplifiers working in parallel This configuration lowers the distortion and noise The amplifiers are working in class A mode and also providing high current driving capabilities that the low noise RIAA equalization needs The power supply for the amplifier is additionally filtered with the in...
Page 8: ... by www audioalto com 8 AA DMI 3 H with radio remote controller ...
Page 9: ...e a push button switch labeled MUTE This is used to MUTE the input signal The primary use of this switch is to allow the user to remove or connect INPUT interconnects cable from the amplifier preamplifier or signal source without the need to power down the amp This feature will prevent speaker destroying bangs hums buzzes and thumps from being passed through the amplifier during these cabling chan...
Page 10: ...enables first order high pass filter rumble filter for the phono Moving Magnet MM input to comply with IEC RIAA standard The cut off frequency is 20Hz 3dB 3 I2 Line 2 input The input is intended for CD players and is less sensitive than I3 input The sensitivity is 500mVeff 4 I3 Line 3 input The sensitivity is 200mVeff 5 Tape in used as input with the same sensitivity as I3 input It can be used wit...
Page 11: ...onnector also holds a Fuse holder and On Off switch You can extract the fuse with a screwdriver There is also a spare fuse Replace the fuse only with the same current ratings fuse ON OFF switch The On Off switch is a mains switch When turned On it powers the control logic The amplifier enters the standby mode To activate the amplifier you must press the POWER STANDBY OPERATE Key on the front panel...
Page 12: ... socket and at the A C amplifier socket 2 Remove the A C power cord at the amplifier and open the fuse hatch on the A C input socket Check that A A slow blow fuse with a rating of 2 Amp 250V 0 25 x 1 25 is installed for 120V AC or 1A Amp 250V 5mm x 20mm for European and Asian versions B That the A C power fuse is intact and has not blown If the power line fuse has blown replace it with a same size...
Page 13: ...dB Tape in RCA 220Kohm 200 mVeff sensitivity line input Noise 95dB Output Tape out RCA 200 mVeff Headphone 0 9 Veff 32 Ohms 7 5 Veff 600 Ohms 4 x Speakers posts 4 mm Vacuum tubes 2 x 6922 E88CC or NOS 6DJ8 Output Power Model A 2 x 30W 8 Ohm 2 x 50W 4 Ohm Model B 2 x 60W 8 Ohm 2 x 100W 4 Ohm Output impedance 1 kHz switchable 0 56 Ohm DF 15 0 16 Ohm DF 50 Frequency response 5Hz to 60 000Hz 1dB Dimen...
