CHUBAN D9 Audiophile-Grade Pure Power Amplifier with Dassault Circuit and No Large-Loop Feedback, 150W*2 with Balanced Input

Product Progress
2015   The first generation of D5 pure power stage was launched
2021   D5PRO was launched   Power tubes were added, power supply was improved, and output power was increased
2021   D9 was launched. Based on the D5PRO pure power stage, a larger chassis was replaced
The new chassis is 450*370*145mm, which is a circle larger and has better heat dissipation; the old chassis is 430*320*125mm
2022 Balanced version of D9     Improved input mode, with single-ended and balanced 2-way input    Can be switched
Line characteristics
Daxiao non-large loop feedback amplifier circuit
Warm, soft, comfortable and pleasant to the ear
High damping coefficient, can control any speaker freely
Making materials
6 pairs in 1 group 3 pairs per channel  Precision test 1% pairing ON MJL3281/1302 High output current capability
The small signal line and high current line in the machine are all made of Taiwan Teflon oxygen-free copper wire
High-end pure copper RCA terminals and terminals
Using 800w high-end Nippon Steel transformer
Fever-grade large electrolytic ELNA FOR AUDIO
Dual-mono design, separate power supply for left and right channels, extremely high separation
With soft start and perfect speaker protection circuit
CNC numerical control processing of all-aluminum high-precision chassis     450*370*145mm
Specifications
Input sensitivity: 1.66Vrms
Input impedance: 22K ohms
Damping coefficient: 500
Output power: 150w/8 ohms, 300W/4 ohms     RMS power, full power long-term stable output
Static power consumption: 120w
Power supply voltage: AC110V   or    AC220V
Chassis color: all silver  or   all black
Total weight: 19kg Weight with packaging: 21kg
Device size: 450*380*150mm     Packaging size: 550*480*250mm
AP test parameters     Tested with 8 ohm 800W load
Output effective value: 36.65Vrms
Channel gain: 26.6dB 21.3 times
Signal-to-noise ratio: 123.4dB
Dynamic range: 123.4dB
THD distortion: 0.0023%
THD+N distortion: 0.010%
Frequency response bandwidth: ±0.047dB
Quality assurance and after-sales service
To ensure quality, each complete machine of Transsion undergoes comprehensive AP testing to ensure that the design indicators are met
Tests include: bandwidth, noise (signal-to-noise ratio), dynamic range, distortion, intermodulation distortion, channel separation, amplification, etc.
The whole machine is tested for 72 hours, the amplifier is tested for 1 hour at full load of 8 ohms, and the listening time is more than 1 hour

D9 2024 version internal diagram (12 large electrolysis)

D9 BC capacitor version uses 12 Vishay BC, 056 series audiophile-grade audio filter electrolytic

D9 pure post-amplifier AP test data with 8 ohm 800 watt resistor