The sound is broken!!! Don't just install a lime resistor on the 400 watt power amplifier driver
This time there is a fairly simple power amplifier, using a small 10 Amper transformer and using 2 sets of mono final transistors, in this video you can see the power amplifier using a 400 Watt driver, with the problem of broken sound, the longer the sound gets more broken, as a result of checking the driver amplifier to the final transistor, it seems I found a chalk resistor value that is not commonly used in power amplifiers, with a very high resistor size, namely 33ohm 5watt. It seems that this is an error in assembling a power amplifier. And I replaced it with a lime resistor with a value of 0.5 ohm 5 Watt and the results were good, the sound was steady and didn't crack any more, even though it was running for hours.
NB: Here are the sizes of chalk resistors that fit the power amplifier, just choose according to your taste...
0.5 ohm 5 Watts, 0.22 ohm 5 Watts, 0.33 ohm 5 Watts and 0.47 ohm 5 Watts.
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