Condition:New
Type:Logic ICs

300B push 845 Class A single-end tube amplifier hifi pure hand

Performance parameters:

● Output power: 25W × 2 (RMS 8Ω)

● Frequency response: 18Hz--35KHz

● Total harmonic distortion: <1% (1kHz)

● Input sensitivity: 500mV--2000mV

● Input impedance: 100KΩ

● Output impedance: 4Ω, 8Ω

● Signal to noise ratio: 89dB

● Volume (width × depth × height): 430 (W) × 340 (D) × 280 (H) mm

● Packing weight: 30Kg

● Electron: Dawning 6SN7 (Soviet Union 6H8C) × 2, PSVANE 300B-SE × 2, PSVANE 845 × 2



After 2 years of preparation and testing, the new 845-A high-power Class A tube amplifier finally met with the fans. This machine adheres to the consistent production concept of the old Chen tube amplifier, the simple and atmospheric overall design, and the stable and nice optimized circuit have improved The performance of the 845 amplifier.

The power supply of the whole machine adopts a high-voltage transformer and a low-voltage transformer to supply power independently, ensuring sufficient power and reducing interference. In the case of no output feedback, the noise floor is controlled within 1-1.5 millivolts, making the timbre sound more powerful Hair broad and natural. Adopt 6SN7 (6H8C) pre-amplification, the sound of 300B-SE promotes the sound 845 high-power bile duct to drive the output transformer, and an efficient and stable fever capacitive coupling is used between 300B and 845. Adopt metal film resistors, ALPS imported potentiometers and imported fever capacitors. The signal amplifying part adopts the method of ceiling welding in order to reduce noise. The power supply part is composed of thickened circuit boards. The high voltage and the sub-high voltage each use an inductive filter with a 30-second delay circuit, which effectively protects the service life of the power tube. The high-quality Taiwanese dual-head dynamic indication makes the whole machine more beautiful and atmospheric.





The direct-heating triode 845 tube amplifier can not only express the natural and delicate vocals and strings, but also be calm and magnificent when it is dynamic, even if it is difficult to push of amplifier, it can perform well.








845 Upgrade fever version:
If your speakers and sound source are very good, and you have a higher pursuit of the sound quality of the machine and the sound level of the tube, you can upgrade a set of tubes specially developed for this machine, upgrade to the pair of 6SN7-SE wave bile, upgrade to the black net A pair of screen hook filament eggplant tubes 300B-SEN, upgrade to a pair of 845SEC black screen carbon spray tubes. The following upgraded pictures and tubes: