A28 Tube and transistor combined power amplifier
A28 Tube and transistor combined power amplifier
integrated tube stereo amplifier

Frequency response: 20Hz-20kHz±0.5dB

Rated output power: 150W+150W(8Ω)

Class A output power: 10W+10W(8Ω)

Bluetooth version: Bluetooth 4.0

Input sensitivity: 200mV

Harmonic distortion: ≤0.1% (1kHz 1W)

Signal to noise ratio: 90dB

Input impedance: 47kΩ

Product weight: 18.5kg

Dimensions (WxHxD): 430x180x456 (mm)

• Equipped with coaxial, optical, Bluetooth and other digital signal input functions

• The audio signal amplifier circuit in the machine uses imported electronic tubes

• The use of electronic tubes, field-effect transistors and integrated circuits hybrid high-precision high-voltage stabilized power supply, sound performance is bold, high voltage stability, low AC ripple coefficient

• The voltage gain stage of the transistor power amplifier part is a common source and common base amplifier mode composed of field effect transistors

• Class A current amplifier adopts Toshiba brand power tube, the sound performance is thicker, warmer and sweeter; the output power is 150W (8Ω) x2 specifications

• The electronic tube circuit cross-connect and de-cross-connect capacitors are German WIMA brand MKP series high-end audio special capacitors.

• The filter capacitor used in the transistor power amplifier power supply is the Japanese ELNA brand FORAUDIO series 10000uf/80v specification.

• The signal input and output lines used in the machine are all single crystal copper high-grade audio signal lines.

• Use the ALPS large remote control volume potentiometer made in Japan; it is reliable and durable, low noise, no sound staining, and small error between two channels

• The output adopts large gold-plated binding posts, which can be easily connected to any speaker wire, and can also be connected with two-wire split-tone connection, so that high and low audio currents can be ideally transmitted.