Marantz Japan w/ VU Meter | 8 VFET in Class A Biased | 37,600 μF Caps | 500VA PSU | 170DC Power Amp

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VERY RARE FIND at THIS CONDITION! Limited Available Globally! 🤩状况如此完好的珍稀藏品！全球限量！🤩
500VA Japan Made Power Transformer 日本制造500VA电源变压器  
Duo Original Big VU Meters 双原装大VU表  
37,600 μF Total Capacitance w/ Duo Large Caps 37,600 μF总电容，配有双大型电容
Dual Mono Circuitry Design w/ Symmetrical Layout 双单声道电路设计/对称布局
Pure Complementary OCL Parallel Push-Pull 纯互补OCL并联推挽  
3-Stage Darlington Circuit 三级达林顿电路  
Differential Amplification 差分放大  
Low-Noise Dual FET 低噪声双FET  
DC Configuration 直流配置  
ESP Protection Circuit ESP保护电路  
Peak Output Monitoring 峰值输出监控  
Logarithmic Compression 对数压缩  
DC/AC Change-Over Switch 直流/交流切换开关
Banana Speaker Terminal for Hassle Free Connection 香蕉插座端子，方便快捷的连接

NOW ONLY RM 3680! 🤯 You CAN HAVE IT on your HIFI Rack!🤩 SHOW IT OFF ~
现在只需 RM 3680🤯！ 你就可以拥有它，放在你的音响架子上🤩！炫一炫它〜
CONDITION 品像: 8/10 = Mint | 非常好

The Marantz 170DC delivers exceptional sound quality, offering a wide bandwidth with impressive high-frequency performance and a firm, controlled bass that exceeds its rated power. Its mid-high range is precise, with detailed instrument textures and excellent voice reproduction, creating an analytical, transparent soundstage. The amplifier excels in sound placement and clarity, especially with cymbals, and is capable of handling demanding speakers without distortion. When paired with the 3250 preamp and Audio Research SP14, the sound becomes even more refined, offering enhanced transparency, a wider bandwidth, and a deeper sound image. While the holographic soundstage and extreme bass extension could benefit from higher-end equipment, it offers great value, outperforming many modern electronics in several key aspects.

Marantz 170DC 提供卓越的音质，具备宽广的带宽和出色的高频表现，低音扎实且受控，功率超过标称值。中高频精确，乐器纹理细腻，声音再现优秀，展现出分析力强、透明度高的音场。它在声音定位和清晰度方面表现出色，尤其是在铜钹表现上，能够轻松处理要求高的扬声器而不失真。当与3250前级和Audio Research SP14搭配时，声音更为精致，透明度增强，带宽更广，声音图像更深。尽管全息声场和极低频延伸仍有提升空间，但在许多方面超越了现代电子产品，具有极高的性价比。
~ Reviewer of audiofanzine 

SOUND QUALITY REVIEW（音色评测）:🤩
- Marantz 170DC delivers a wide bandwidth, particularly excelling in the high-end frequencies.
- Bass is firm, controlled, and dynamic, with power exceeding the advertised 85W, reaching around 120W.
- Mid-high range is precise, with excellent voice reproduction and detailed instrument textures.
- Analytical and transparent, offering great precision, especially with cymbals and sound placement.
- Creates a three-dimensional soundstage, spreading sound behind the speakers rather than pushing it forward.
- Can handle demanding speakers and loads without distortion, maintaining clarity and precision.
- Paired with the 3250 preamp, it creates a highly successful synergy with a clean, clear, and precise sound.
- With Audio Research SP14, the sound becomes even more profound, with enhanced transparency, a wider bandwidth, and a deeper sound image.
- Room for improvement in terms of the holographic soundstage and extreme bass extension, which require a higher-level system for full realization. 
- Offers great value for its price point, with performance that surpasses modern electronics in many aspects.

- Marantz 170DC 提供了宽广的带宽，特别是在高频表现上尤为出色。
- 低音扎实、受控且富有动态，功率超过了标称的85W，达到大约120W。
- 中高频精确，声音再现优秀，乐器纹理细腻。
- 分析力强，透明度高，尤其在表现铜钹和音场定位时展现了极好的精准度。
- 创造了一个三维的声音场，声音似乎在扬声器后方扩展，而不是向前推进。
- 能够处理要求高的扬声器和负载，不失真，保持清晰和精准。
- 与3250前级搭配时，声音表现出色，清晰、明晰、精准。
- 与Audio Research SP14搭配时，声音变得更为深邃，透明度增强，带宽更广，声音图像更深。
- 在全息声场和极低频延伸方面有改进空间，这需要更高阶的系统才能充分实现。
- 以其价格点提供了极高的性价比，性能在许多方面超越了现代电子产品。

DESIGN & TECHNOLOGY 设计与科技:
- Stereo power amplifier refined from Marantz's tradition with advanced technology to eliminate transient intermodulation distortion (TIM).
- Fully independent symmetrical layout, inspired by the Model 250.
- Pure complementary service OCL parallel push-pull 3-stage Darlington circuit with DC configuration.
- Uses specially designed low-noise elements to enhance load resistance and power linearity.
- Differential amplification cascode bootstrap circuit with low-noise dual FET in the first stage to minimize temperature and time drift, ensuring stable DC operation.
- Large transformer and 18,800 μFx2 large capacitor used for the power supply.
- ESP circuit for protection against excessive output current, voltage, or DC generation, ensuring safe signal limits for driver transistors.
- Protection circuit detects frequency, time, and total energy, protecting the program without intermediate steps.
- Relay with a 4-second delay circuit to prevent shock noise at power-on and automatically separates and protects the speakers.
- Equipped with a large power meter that monitors peak output levels from -40dB to +3dB with logarithmic compression.
- Peak indicator for easy level adjustment.
- DC/AC change-over switch to prevent DC leakage from the preamp when combined with the DC power amplifier.

- 立体声音频功率放大器，结合了Marantz的传统与先进技术，旨在消除瞬态互调失真（TIM）。
- 采用与Model 250相似的完全独立对称布局。
- 采用纯互补服务OCL并联推挽三极管达林顿电路，具备直流配置。
- 使用专门设计的低噪声元件，提高负载电阻和功率线性度。
- 第一阶段采用差分放大卡斯科引导电路，配有低噪声双FET，最小化温度漂移和时间漂移，确保稳定的直流操作。
- 电源部分配备大型变压器和18,800 μFx2大电容器。
- 采用P510M中的ESP保护电路，可以检测输出端的过大电流、电压或直流生成，并将信号限制在驱动晶体管的安全值内。
- 保护电路检测频率、时间及总能量，在无中间步骤的情况下保护程序。
- 配备延时电路（4秒）继电器，以防止开机时的冲击噪声，并自动断开保护扬声器。
- 配备大型功率表，可监控左右声道的峰值输出水平，范围为-40dB到+3dB，采用对数压缩。
- 配备峰值指示器，便于水平调节。
- 配备直流/交流切换开关，解决与直流功率放大器结合时前级放大器的直流泄漏问题。

SPECIFICATIONS 规格:🧾
- Type: Stereo power amplifier
- Rated Output (20 Hz to 20 kHz, Both Channel Drive): 110W + 110W (4 Ω), 90W + 90W (8 Ω)
- Total harmonic distortion factor: 0.03%
- Cross modulation distortion factor: 0.03%
- Frequency characteristic: 20 Hz ~ 20 kHz + 0 -0.2 dB
- Input Sensitivity / Impedance: 1.5V/30k Ω
- Residual noise (IHF-A): 0.046mV
- Damping factor: 60
- Power consumption: 225W (Electrical Appliance and Material Control Law), 490W maximum
- External dimensions: Width 416x Height 146x Depth 301 mm
- Weight: 14.1kg

REFERENCES 根据:🫡
1.https://www.hifiengine.com/manual_library/marantz/170dc.shtml
2.https://reverb.com/item/37369190-marantz-170dc-stereo-power-amplifier-in-very-good-condition
3.https://en.audiofanzine.com/hifi-amplifier/marantz/170-dc/

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1. After Audition U LIKE THEN U BOUGHT, No DING DONG here & there, NO EXCUSING Don't like this or that afterwards. (Please be Considerate WE ARE BUSINESS)
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