Imitation Berlin Voice 933 Current Feedback Amplifier Kit Also has a finished board
This circuit kit is a spare part and needs to be self-welded and debugged. The price is 2 channels, but does not contain 2 pairs of three-ken power tube
Please select the kit and finished board according to your individual ability level. The finished board is complete
The 933 board can be adjusted to Class A. At this time, the test point voltage is adjusted to 200-300 MV, but it should be noted that the side of the heat dissipation is above 2KG and the temperature is high
Normally adjusted to 20-50MV, the type A and B are suitable, the temperature is low, and the sound quality is very delicate.
Everyone does not have the same heat dissipation. Do not blindly increase the current arbitrarily.
Lin Zhisheng&x27;s equipment is famous for its delicate and gorgeous sound, strong dynamics and strong sense of the scene. It is one of the high-end HI-END brands that are recognized internationally today. In the past two years, it has only begun to vigorously explore the Chinese market. It can be seen in the recent major audio exhibitions. Every time it debuts, it must be one of the best in the audience. It has won the recognition of many fans, its strength and The quality can be seen.
The full range of post-stage amplifiers from Berlin Sounds have extremely low output impedance and very high damping factor. Even with 933 output power of only 120W@4Ω, it has perfect low-frequency control and unique current feedback. Technology, for some "notorious" difficult to control the speaker can handle it freely, in the match with the Dynaudio series speakers, there is a very outstanding performance, with an invincible noble tone.
This kit includes a DC servo circuit and is extremely stable at midpoint. As long as the kit can adjust the quiescent current, use the 200MV file of the digital meter to test the range of 20-80MV of any one white 5W resistor.
The price of the finished board is $40.
Power range: DC+_30V to +-60V The kit is now equipped with a 220U 63V capacitor instead of the 470U50V in the picture to ensure normal operation at 60V operating voltage.
The actual listening sense of the kit is good control, the low frequency is solid and powerful, and the air on the spot is excellent.
The three-energy push tube and constant current diode included in the kit are very expensive devices.
The material of this kit is very particular, Sanken original drive tube, high-precision current-flow diode, Philips non-inductive resistance, Germany WIMA red Wei Ma capacitor.
Wiring is also simple, with the letter pad symbol on the board, OUT is the output, GND is the ground, and VCC is the power input. VSS is the negative power input
PCB size: 142MMX72MM
Output power: 130WX2 8 ohms 180WX2 4 ohms
Frequency response: 10HZ-40KHZ
Distortion: 0.001% 1KHZ
Signal to noise ratio: 105DB