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来自德国的Octave,在2014香港高级视听展上带来了最新的前级放大器HP700,它设有三组RCA及两组XLR输入,并提供两组XLR及一组RCA输出。备有一个输出阻抗切换功能和三段的增益设置,切合不同后置放大器的需要而设定。采用独立的分体式电源设计,用上特别定制的变压器,以增加电路的耐用性。Octave总裁Hofmann在专访时透露,HP700是以HP 500 SE为蓝本而重新设计,在速度、电子管的低频表现、供电的稳压处理、频宽的设计等方面都有大幅度的改良,分离式电源的设计可以使到HP700与市电带来的杂讯完全分离,电气噪声降低到1毫伏的水平。机器多处使用模块化的设计,例如在音量控制电路有标准版本和47级步进控制的版本可供用家选择,使用了镀金的触点所以讯噪比非常高,用家可向厂方购买自行升级。前级放大的三级增益能在92dB至106dB之间选择。Hofmann开诚布公地强调,有负反馈放大线路的功放才是理想的前级设计,他这样做的
Octave from Germany brought the latest preamplifier HP700 at Hong Kong Advanced Audiovisual 2014 with three RCA and two XLR inputs and two XLRs and a set of RCA outputs. Equipped with an output impedance switching function and three sections of the gain settings, to meet the needs of different post-amplifier settings. Using a separate split-type power supply design, with special custom transformers to increase the durability of the circuit. Octave President Hofmann revealed in an interview that the HP 700 was redesigned based on the HP 500 SE and has been greatly improved in terms of speed, low-frequency performance of the tubes, regulation of power supply, and bandwidth design. The split-type power supply The design allows the HP700 to be completely separated from the mains noise, reducing electrical noise to a level of 1 millivolt. Multi-use of the machine Modular design, for example, the volume control circuit has a standard version and step 47 step control version for the user to choose the use of gold-plated contacts so the signal to noise ratio is very high, the user can buy from the factory Self-upgrade. The first stage of amplification of the three-stage gain can be 92dB to 106dB between the choice. Hofmann frankly emphasizes that amplifiers with negative feedback amplification are the ideal front-end design and that he does