 Integrated Stereo Amplifier E-306V
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Based on the highly successful Accuphase integrated amplifier E-306, the model E-306V is a further refined and enhanced instrument for totally
faithful music reproduction. It reflects the extensive experience Accuphase
has gained in building superb separate-type amplifiers. Every single aspect
has been honed to deliver optimum performance.
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Parallel push-pull output stage delivers quality power: 140 watts/channel
into 4 ohms, 120 watts/channel into 6 ohms or 100 watts/channel into 8
ohms
The power transistors are designed for audio applications and have been
selected for optimum frequency response, forward-current transfer ratio
linearity, and switching performance characteristics. The devices are connected
in parallel and mounted directly on a large heat sink for efficient dissipation
of thermal energy. This allows the E-306V to deliver ample power output,
amounting to 140 watts into 4 ohms, 120 watts into 6 ohms, or 100 watts
into 8 ohms per channel.
Current feedback circuit topology in power amplifier and line amplifier
sections prevents phase shifts
Accuphase's highly acclaimed current feedback topology is used in both the preamplifier and power amplifier. This innovative principle eliminates phase shifts in the upper frequency range and assures stable operation and uniform frequency response which does not change with gain. Phase compensation can be kept at a minimum, and high amounts of negative feedback with their associated disadvantages are no longer required, resulting in excellent transient response, with superb sonic transparency and detail.
Discrete-type line amplifier for superior sonic purity
The line amplifier whose circuit diagram is entirely built from discrete parts, to assure optimum performance. A differential pure complementary push-pull circuit is used, with an emitter follower output stage. Current feedback topology further enhances circuit operation and reduces the need for phase compensation, resulting in effortless, utterly natural and transparent sound.
Highly reliable logic-controlled relays
Program source switching is performed by logic-controlled relays which are arranged to permit the shortest possible signal paths. The hermetically sealed relays are high-quality types developed specifically for demanding communication applications. The contacts are twin crossbar types plated with gold for minimum contact resistance and outstanding long-term reliability.
Tone controls use summing active filters for pure sound
The tone control circuitry in the E-306V was specially designed with summing
active filters such as found in high-quality graphic equalizers. The flat
signal is passed straight through, and only when an adjustment is required,
the characteristics are created and added to the signal, thereby producing
the desired change. This design provides efficient control without diluting
signal purity.
Robust power supply with large power transformer and high filtering capacity
The power supply plays a vital role as the source of energy for the power amplifier section. The E-306V uses a large 500 VA power transformer and two massive electrolytic capacitors rated for 22,000 uF each. This assures ample reserves also for reproduction of demanding bass passages. The preamplifier section has its own dedicated power supply circuitry, to prevent the possibility of interference via the power supply line.
Direct-reading peak power meters
The analog power meters have a peak hold function which lets you easily monitor the output level of the rapidly fluctuating music signal. Thanks to logarithmic compression, the meters cover a wide dynamic range.
SEPARATE switch allows independent use of preamplifier and power amplifier sections
Separate preamplifier outputs and power amplifier inputs, controlled by a selector switch, allow use of the preamplifier section and the power amplifier section as separate components.
Versatile input configuration including balanced connectors
The input selector of the E-306V controls a total of eight positions, including
two tape recorders and a position for an optional input board installed
in the rear-panel slot. Two of the standard inputs are designed for balanced
connections which are impervious to externally induced noise, ensuring
signal transmission with optimum sonic purity.
Remote commander allows source switching and volume adjustment
The high-quality volume control in the E-306V can also be operated via
the remote control from any convenient location. The control also allows
input source switching.
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Line Input Board LINE-10
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This option board provides an additional set of conventional line inputs
which can be used to connect a CD player, tuner, or other component with
analog output.
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Analog Disc Input Board AD-10
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This board contains a high-performance, high-gain phono equalizer. The
board can be used with any type of phono cartridge. Internal DIP switches
control MM/MC operation, MC input impedance, and subsonic filter on/off.
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Gain[dB] |
Input impedance[ohm] |
| MM |
29 |
47k |
| MC |
60 |
10/30/100 |
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