Product Background
The design intention of this amplifier is centered on aesthetic appearance, breaking the traditional design concept of electronic tube amplifiers and abandoning the use of traditional voltage amplification electronic tubes. The STK350-230, which is selected as the voltage amplification stage and has excellent performance, has a distortion as low as 0.005%. The core design selection is to fully meet the power requirements of EL34 electronic tubes at a working voltage of 450V.
The circuit structure adopts a super linear parallel design, which faces two major new challenges in the stage: one is the balance control of the working current of the electronic tube, and the other is the tedious problem of specifying the position of the electronic tube insertion when customers use it. In response to the above issues, the R&D team innovatively designed an exclusive negative pressure servo feedback circuit, which can automatically correct the bias current of the electronic tube and achieve dynamic balance of the working current; At the same time, it supports the insertion of electronic tubes without specifying the position, greatly improving the convenience of use. In addition, the circuit can automatically deepen the negative pressure according to the actual working state of the device during operation, effectively improving the working range of the electronic tube, allowing the power amplifier to work stably in Class AB state, and ultimately achieving strong power, fast transient response, and clean sound performance in acoustic effects.
Parameters
Brand:BRZHIFI
Model:H-PAT-88 push-pull amplifier
Electronic tube:EL34 * 8 pieces
Input interface:RCA
output interface:Terminal 0-4-8-16 Ω
Sound channel:2.0
Output power:90W+90WRMS
Input sensitivity:0.4V
Output impedance:0-4-8-16Ω
Signal-to-noise ratio:-90dB
Total Harmonic Distortion:≤1%
Frequency response range:20Hz-20kHz-0.5dB
Working Voltage:110/220V switchable
Power consumption:450W
Size:473 * 452 * 160mm
Weight:26.7kg
