CHUBAN Reference FM Circuit Dual-Channel HiFi Pure Power Amplifier, 250W/8Ω, 500W/4Ω, Single-Ended Balanced Input

MASTER Master Edition FM801 8 aspects of upgrade
ON tube king MJL4281 28 pieces per group, matching accuracy 1%
Higher-end terminal
Higher-end RCA terminal
Single crystal copper signal line
Shut power socket
5 Shut gold fuses
Photoresistor
More stringent debugging test
Line characteristics
FM original parameter core circuit
The left and right channels are completely independent, without electrical connection
Beyond the layout of the original machine, the whole machine is super stable, without any noise
This machine has single-ended and balanced 2-way input, can be connected to 2 pre-stages, and uses relay switching
Material production
16 new test pairs <1% gold seal tube 2N3440/5416 produced in recent years
Test pairing 28 pieces per group <1% original brand new ON tube king MJL4281 Need to be selected from thousands of pieces
Each large tube is connected in parallel with a decoupling capacitor and a decoupling electrolytic capacitor
1200w high-quality Nippon Steel transformer Independent windings for left and right channels
80000uF ELNA FOR AUDIO high-quality capacitors
Soft start at power on and perfect speaker protection circuit
All-aluminum chassis processed by CNC precision CNC machine tools
Specifications
Input impedance: 18K ohms
Damping coefficient: 500
Output power: 250w/8 ohms, 500W/4 ohms RMS power, full power long-term stable output
Static power consumption: 110w
Power supply voltage: AC110V or AC220V
Chassis color: all silver or all black
Total weight: 22kg with packaging weight
Total size: 450*155*390mm with packaging size: 550*260*500mm
AP auxiliary design and test parameters with 8 ohm load test data
Output effective value: 45.7Vrms
Channel gain: 31.7dB 38.6 times
Signal-to-noise ratio: 124dB
Dynamic range: 124dB
THD distortion: 0.0016%
THD+N distortion: 0.0021%
Frequency response bandwidth: ±0.014dB
Quality assurance
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 audition is more than 1 hour

FM801 Master Edition AP Test Each channel has 8 ohm 700W resistor

Distortion and waveform at full load output (45.4v/8 ohm load)

Adopt original brand new precision matched gold seal tube

One machine uses 28 ON high power tube king MJL4281 test pairing

Master Edition Picture