4706Gaincard Instruction Manual
Model 4706 GAINCARD was originally created as a reference
amplifier of 47Laboratory. Behind it was my frustration about the
way music was reproduced through Compact Disk.
People often remark that analog playback is superior to CD
playback in retrieval of details and recreation of the ambience of the
recording venue, and they fault the CD for these shortcomings. While
today’s CD format is far from perfect, it still contains an amazing
amount of information on it.
The problem is not with the CD itself. The problem is with the
equipment we use: playback systems are not capable of properly
retrieving the informations in the CD, and amplifiers are still
designed based on the concept of analog playback.
To overcome these problems, we had to reevaluate the
fundamentals of the CD transport and DAC, and also had to create a
new-concept amplifier that would meet the specific requirements for
digital reproduction of music.
In digital music reproduction, the following characteristics of
an amplifier are sharply reflected in the recreated sound:
# Response to the transient speed of the signal
# Response to small-level signals
# Severity of left and right channel symmetry
When I began to design Model 4706, I knew I could not
depend on current standard of amplifier design.
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In Model 4706 GAINCARD,
# The signal pass length is as short as possible.
#The energy supply depends on the capacity of the electrical
transformer instead of the capacity of the condenser.
# The capacity of the electrical condenser has been minimized
to avoid electrical energy storage.
# The chasis is light and rigid to avoid mechanical energy
storage.
# Interference between left and right channels has been
eliminated.
# Complete symmetry between the signal pass of each
channel, symmetry in the layout of the parts and in the
operation of each channel has been achieved.
Model 4706 GAINCARD finally fulfills my goal to create a
design for the digital age.
47Laboratory
President
Junji Kimura
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Model 4706 GAINCARD
Model 4700 POWER HUMPTY
Spike Receptor (3)
Model 4700 rests (2)
Additional Fuse (1), inside the fuse box
Owners Manual
1. Connecting the amplifier to the power supply.
Plug the two connector cables of the amplifier into the receptor
located at the rear panel of the power supply. Make sure to push
them into the receptor until they lock firmly. There is no specific leftright combination.
2. Connecting speaker cables and line cables.
Speaker cables should be connected properly to each left and
right + and – terminal using Phillips screwdriver for loosening and
tightening the terminal.
Line cables should be connected to each RCA terminal.
3. Connecting power cord.
Make sure the “operate” switches on the front panel of the
amplifier are in the off (down) position. Turn down the volume
attenuator all the way counter-clockwise. Connect the power cord to
the receptor at the rear panel of the power supply. The LED lamp on
the front panel of the power supply will light up, indicating that the
power is on.
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4. Start the music!
Turn the operate switch on (up). Turn the attenuators
clockwise to your choice of sound level.
# Operate switches
Operate switches connect the amplifiere to your speakers. At
the off position, the amplifier is disconnected from the speaker
and no current runs into them. At the on position, current
flows into the speakers. Using this switch allows you to avoid
disconnecting the amplifier from the power supply each time
you change the connection of line cables and/or speaker
wires.
5. Turning it off
Turn down the attenuators to the minimum position. It is
designed not to turn down to zero, so you will still hear a low volume
of the sound at the minimum position. Turn off the operate switches.
# We recommend that you leave the power on unless you are
not planning to play your system for a long period of time, a
vacation, say. This keeps the amplifier at certain warmth,
making the warm-up time shorter when you start again.
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About break-in
A brand new amplifier requires several hours of running with
actual music signals to start making them into music. We suggest 50100 hours of break-in period to reach its maximum performance.
Thermal protection
This amplifier has a thermal protection in each left and right
circuitry to protect them from heat resulting of continuous high-load
operation. When the temperature inside the amplifier reaches its
programmed point, the thermal protector is automatically activated
and shuts the circuit down. When this happens, you can turn off the
amplifier or leave it until the temperature drops and reconnects the
circuitry automatically. SInce each channel has a separate thermal
protector, it will not be activated at the same time.
Input impedance:
Output power:
Attenuators:
Input:
Fuse:
Measurements:
22 kOhm
25w+25w (8Ohm)
left and right separate,
Individual L-pad type
1pair (unbalanced)
5A
4706 170 (w) x 100 (d) x 40 (h) mm
4700 130 (∅) x 195 (d) mm
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Any attempt to open the casting and/or tempering with the
circuit without proper instructions from the manufacturer or certified
dealers/distributor will invalidate the warranty.
The amplifier can get quite hot after a continuous operation.
Please be careful when you touch it under these circumstances.
This product is designed for home audio use only. We are not
responsible to the cause of any improper use of this product.
KONUS AUDIO SYSTEMS
Alipasina 45-a, 71000 Sarajevo
Bosnia and Herzegovina
Tel.: +387 66 171641
Fax: +387 33 201066
E-Mail: distribution@konus-audio.com
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