Product Description:
KSA50
and KSA80 are praised as the most vocal Krell amplifiers, among which
KSA50 is Krell&x27;s first power amplifier, and it is also the peak of its
home (in terms of tone). To this day, Nelson Pass, the chief designer of
the American premium audio brand PASS and the founder of the best sound
brand Threshold, also said that the KSA50 line is better than the
current 95% HI-END amplifier The KSA100 is the KSA50 upgrade board. The
power is further improved when the sound color is unchanged.
product details:
1 Original MJ15024G/MJ15025G and TSB A1930/C5171.
The 2-stage coupling capacitor uses WIMA top-level capacitor 1UF, which has natural sound and wide sound field.
3 The resistor uses a five-ring metal film resistor with an accuracy of ±1% to ensure a good signal-to-noise ratio.
4 PCB adopts 1.6mm thick double-sided sheet, 2.0 oz copper thick spray tin process to ensure the size current
Good pass performance. First-class PCB quality.
5
The biggest feature of this board is the use of advanced speaker
protection circuit to effectively eliminate the impact of opening and
closing.
Sound and DC output protection makes your speakers safer.
6
Input voltage: positive and negative 30V-50V DC, AC single 12V-15V
(single group, two-channel two groups). It is recommended to use +-45V
7 Output power: Class A 100W+100W does not distortion power, Class A and Class B is 350W+350W undistorted power output.
8 output impedance: 4-8 ohms
Single board size: 271*121*40mm (with heat sink)
Debugging steps:
1.
Static current regulation: After the welding is completed, install the
heat sink (note that the tube and the heat sink should be insulated),
adjust the VR2 (5K) precision adjustable resistor so that the board has
two points on the A/B (located on the top left of the board). Angle) The
voltage is 22mV. At this time, the quiescent current is 100mA/tube
(22mV divided by 0R22 resistance). The quiescent current is increased
counterclockwise, and the clockwise quiescent current becomes smaller.
The
KSA100 MKII original board is designed as Class A 100W, and the
quiescent current is adjusted to about 550MA (ie: the A/B voltage
adjustment of this line is about 120mV). If the buyer&x27;s heat sink is
large enough (one channel is 3.5KG or more), it can be adjusted by
itself. Class A working state; Note: In addition to the heat sink is
large enough, the power of the transformer should be large enough. The
filter capacitor is at least 20,000 microfarads per channel. It is
recommended to use 40,000 microfarad capacitors for one channel.
Otherwise, Because the Class A consumes too much current, the power
supply and the filter capacitor capacity are insufficient, the
distortion will increase Adjusting to Class AB (200mA) sound quality is
also a good choice
2.
Midpoint voltage regulation: Adjust VR1 (5K) tightly adjustable
resistor so that the output (OUT) to ground (ie, both ends of the power
amplifier output terminal) is zero millivolts; the counterclockwise
midpoint voltage decreases, clockwise increases
CNC Seiko flat radiator KSA100 picture:![](https://ae01.alicdn.com/kf/H81a052a54200427ba5d81a1b64aa2431i.jpg)
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