Amplilfier power circuit from the beginning until now not much changed. Some say this is good circuit, the circuit is good but fitting assembled and tested the result was not as we expected. The problem that there is usually treble is less smooth, less noise kenceng, broken voice, hum,
tested middle ground bass sound is lost. so you do not have to believe what people say 100%. Quality amplifier built-up must be different from the amplifier assembly, the circuit can be the same but the quality will depend on who assemble. Want to know the secret?
Here are a few tricks that need to be tried.
COPING hum :
Power amplifiers are often used in the field jacket. The circuit is said to Bell said people were assembled. But you do not immediately attracted to this power, the circuit is rather complicated & difficult to understand reflect the intelligence of the person who first mendisainnya. In my opinion a great power is the power of simple, inexpensive, easily assembled and rational. You do not need to use components with high prices such as tantalum capacitors, power mosfet and the other expensive. This does not determine the quality of the power amp once we raft. Power of sometimes causing buzzing, to overcome that is by holding the line on the ground socket input ground with 10-22 ohm resistor. So the ground is not directly take input from the ground but held first with the R 10 ohms.
SETTING HOW BIAS trimpot :
Turn the bias trimpot (if any) until the drain current of 50-100mA on each power transistor, in order to avoid defects in the position treble volume over 10 hours. The risks are so hot heatsink! (This setting marks on plate A-AB)
