Overview:
This line is the force, KRELL KSA50 handed down generation of machine;Complementary differential input, America&39;s top sound PASS the chief designer of Nelson PASS also say, KSA50 lines than the current 95% of HI - END amplifier well;Transistor 2 sc2240, 2 sa970 BD139, BD140, 2 sc5171 drive pipe, 2 sa1930 are imported, Toshiba, Hitachi, tube;Power amplifier fill tube for classic Toshiba name sc5200 2 + 2 sa1943;Buyers can also choose not to fill, choose other power tube, such as manufacturing, etc.;Different power tube sound power and the effect of different listening this as is known to all, buyers can try...
Technical parameters:
Output power: 150W / 4ohm load; (Total harmonic distortion THD + N <0.3%), DC +-50V, 4 ohm load measured.
Speaker Impedance: Available 4-8 ohms.
PCB size: 138 * 56MM. Very small, suitable for connecting
Power supply: DC Dual 18-50V transformer 200 watts or more, the need to replace withstand higher voltages higher capacitance.
Discrete Tube: 2SA1943 2SC5200, classics on the tube(Actual delivery of boards).
This suite of lines from the force KRELL KSA50 handed down generation of machine.Complementary differential input.
notice:1.A piece of circuit board is only one channel,Stereo need two pieces of current board
2.Electricity must be installed before the radiator
Debugging steps:
1) after completion of welding with good heat sink (note that the pipe and the heat sink should be insulated handle), adjusting VR2 (5 k precision is adjustable
Resistance) makes the static current, about 50 ma VR2 counterclockwise static current, clockwise is reduced.Suggestions on electricity clockwise twist laps beforeSafetyDon&39;t put wrong resistor
2) neutral zero, adjust VR1) (20 k closely adjustable resistance, make the output (OUT) of terminal ends (i.e., the power output)
Close to zero millivolt;
More mono amplifiers&39; pictures for you ref:
product/hot-sale-mono-amplifiers-krell-ksa50-class-A-high-power-50W-mono-Power-amplifiers-KSA50-professional/1123215_32365007766.html
Remember that the polarity of the dc voltage power supply end don&39;t answer the reverse,the same to Audio input terminals.
PCB size: 56mm*138mm
Power supply:DC double 18v to 35v, recommend to use DC double 35V
Note that this amplifier power is rectified and filtered DC power supply after a double, not directly connected to the transformer.