KSA50 Amplifier Board 50W+50W 2SA1943/2SC5200/MJE15034/MJE15035 Class A Pure After Class

KSA50 Amplifier Board 50W+50W 2SA1943/2SC5200/MJE15034/MJE15035 Class A Pure After Class

Description:
The KSA50 and KSA80 have been regarded as the most vocal Krell amplifiers, among which the KSA50 is Krell's first amplifier and is the pinnacle of its home (in terms of timbre).  Until today, Nelson Pass, the chief designer of the U.S. Audio Brand Name Pass, and the founder of Threshold, another excellent audio brand, also said that the KSA50 line is superior to the current 95% HI-END power amplifier!

Product Details:
- The original Toshiba 2SA1943/2SC5200 and MJE15034/MJE15035 are used.
- Inter-stage coupling capacitor uses WIMA top capacitor 1UF for natural sound, wide sound field
- Resistors use high-precision cylindrical color ring chip resistors, the main circuit uses ± 1% accuracy of the five-ring metal film resistors to ensure a good overall signal to noise ratio.
- The PCB adopts a 1.6mm thick double-sided plate and a 2.0oz thick copper spray process to ensure good current performance. First-class PCB quality.
- Use advanced speaker protection circuit to effectively eliminate the impact sound and DC output protection function of opening and shutting down, making your speaker more secure.
- The layout of the entire circuit board layout is quite rigorous and reasonable. The overall PCB layout uses a point grounding method.  The power amplifier board is stable and reliable, and has a large output power; the sound is mellow and the sound field is open.  Strong sense of three-dimensional, low-frequency solid and powerful, signal-to-noise ratio is very good, wide dynamic range; clear details, excellent transient response, playing all kinds of music to cope with, in the family's playback environment has a very good performance.
- The price is for a pair of amplifier boards.

Parameters:
- Input voltage: positive and negative 30V-50V DC, AC 12V-15V (single group, two-channel two groups).  It is recommended to use +-45V
- Output Power: Class A 50W+50W undistorted power, Class A and B are 250W+250W undistorted power output
- Output Impedance: 4-8Ω
- PCB Size: 280 x 64mm

Note：
- After the power is on, the red light is on and the circuit is normally green for 3-5 seconds.
- The quiescent current is recommended to be 1.2A. At this time, the heat sink should be more than 4kg.
- JP6 JP7 are the quiescent current test points.

Package Included:
- 2 x KSA50 Amplifier Boards