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本帖最后由 叶荣玉 于 2015-12-18 08:52 编辑
休息日闲来无事:侃侃被很多人遗忘的一件神器——DENON Pra-2000/poa-3000 前后级放大器（1979年出品）。DENON Pra-2000/poa-3000 搭配什么音箱听，给人石机“胆味”般的耐听。仿佛将你带回到真正的模拟时代。声音是那么的顺耳。
The Denon POA-3000 was built when Denon was gaining fame in the 80's and their products were highly regarded. It is a solidly built and magnificent amplifier, and its outer design is stripped to its bare necessities without unnecessary functions, having two large meter readings and a power switch. The Denon POA-3000 power amplifier is among the first series of Denon audio products designed and built in line with the guiding concept of REAL TIME AUDIO TECHNOLOGY, a new term signifying Denon's new approach to reproduction of real music. The POA-3000 is a new Class-A amplifier unit in which the inherently low efficiency associated with Class-A is eliminated by advanced design features involving 20 patents pending. Thus, it is capable of high-output operation without sacrificing the advantage of Class-A mode which includes wider audio band coverage with distortionless amplifying action.
Freedom from crossover distortion and switching distortion is accounted for by Class-A, and high output by the new scheme called "real bias circuit" that successfully endows Class-A with high efficiency. Seven of the 20 pending patents reside in this circuit. Also, ten power transistors with improved characteristics in the upper frequency range are used in 2 parallel rows of 5 transitors each to constitute the power stage. The power stage highlights broader bandwidth, minimized distortion, and excellent linearity particularly in high-out operation with higher frequencies. The power stage is also protected by small-signal transistor to form a cascode emitter-follower drive circuit for none distortion broadband to prevent the high-frequency characteristics from deteriorating due to junction capacitance in power transistors.
Rated at 180W Class-A, the Denon POA-3000 can be matched perfectly with the Denon PRA-2000 preamplifier to produce a beautiful and clear sound that makes music a joy to listen to. Different pitches and instruments of the performance can be discerned easily and the music passage are not muddled up in a cacophony. The Denon POA-3000 is becoming a very rare piece of equipment and it is no doubt a true statement piece for audiophiles.
Specifications :
Music Power...................................250 watts + 250 watts (8 ohm load)
Rated Output..................................180 watts + 180 watts Class A, 20Hz to 20kHz
Total Harmonic Distortion.................0.002% or less (20Hz to 10kHz)
..................0.003% or less (20Hz to 20kHz)
Cross Modulation Distortion..............0.003% or less (At the time of 180 watts equivalent)
Output Bandwidth............................5Hz to 100kHz (THD 0.02%) (IHF, both channels driven)
Input Sensitivity/Impedance..............1V/50k ohms
Output Load Impedance...................0.04%(1kHz)
Dumping Factor..............................200(8 ohms, 1kHz)
Signal-to-Noise Ratio.......................122dB or more (IHF-A)
Speaker Terminals...........................One system; 8 ohm for optimum load impedance
Transmission Characteristic.............1Hz to 350kHz, +0dB to 3dB
Subsonic-Filter Characteristic...........16Hz, 6 dB/octave
Separation......................................100dB or more (20Hz to 1kHz)
.......................................85dB or more (-20kHz)
Slew Rate.......................................More than +/-300V/microsecond
Frequency Response.......................10Hz to 100kHz, +/-3dB
Level Meter Characteristic.................Indicating type: Peak value indicating type output level meter
..................Indicating range: -50dB to +5dB and 0dB=200 watts/8 ohms
Power Supply Voltage......................230V, 50Hz
Power Consumption.........................220 watts (Idle)
.........................1300W (Max)
Dimensions(w x d x h)......................49.5 x 46 x 19 cm
Weight............................................32kg
直接翻译：
描述: 天龙poa - 3000建立了天龙获得名声在80年代时,他们的产品是高度重视的。它是坚固和宏伟的放大器,其外层设计是剥夺其必需品没有不必要的功能,有两个大仪表读数和电源开关。天龙poa - 3000系列功率放大器是最早的天龙音响产品设计和建造符合指导实时音频技术的概念,一个新的术语代表天龙真正的音乐的新方法繁殖。《行动纲领》- 3000是一种新的甲级放大器单元的固有的低效率与甲级被先进的设计涉及20项专利未决的特性。因此,它能够高通量操作不牺牲甲级模式的优势包括更广泛的音频频带覆盖无失真放大操作。
自由从交叉失真和切换失真由甲级占,和高输出的新计划称为“真正的偏置电路”,成功地赋予甲级效率高。七的20个未决专利驻留在这条赛道。同时,提高特色十功率晶体管上使用频率范围2平行排5 transitors每个构成功率级。功率级强调广泛的带宽、最小失真,和优秀的线性特别是高处操作更高的频率。功率级也保护小信号晶体管形成共源共栅射极跟随器驱动电路没有失真宽带防止高频特性恶化由于功率晶体管的结电容。
额定功率在180 w偏置纯甲类的天龙poa - 3000，可以完全匹配与天龙pra - 2000前置放大器，产生一个美丽的和清晰的声音,让音乐快乐听。不同的音高和仪器的性能可以很容易地分辨和音乐通道不是混乱嘈杂。天龙poa - 3000正在成为一个非常罕见的设备,它无疑是一个真正的发烧友的语句块。
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人老是自然规律。等那些老的烧友仙去，你也会变老了的。当你老了的时候你会知道，在对声音的整体领会中，並不是能听到更高频率，就等于会听音乐。总不会认为儿童比你更会理解音乐吧？而且这样不着边际的比较，什么也说明不了吗，这就像说调查过某二个收入相差几十倍的人，证明收入
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