I repaired this amp, or so I thought. I have replaced the fets and every one of the 1a, 2a, and 5d transistors.
The issue is, on one of the channels, anything below 15hz or above 30hz there is a strange audible distortion. I have included a pic of the wave form with the distortion.
The issue is, on one of the channels, anything below 15hz or above 30hz there is a strange audible distortion. I have included a pic of the wave form with the distortion.
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It appears to be functional.
I know 5d is a diode. I thought about that as I was typing it😁 I figured u would know that already
I know 5d is a diode. I thought about that as I was typing it😁 I figured u would know that already
At this point, I'm just concerned as to whether the bias affects the distortion.
In general, for most amps, if it's set to where you just see an increase in current draw, that's high enough. If you're concerned if it's enough, you can run a sine-sweep (about 1v into a dummy load, I generally use 4 ohm) to see if it's clean at the 20kHz end of the spectrum.
In general, for most amps, if it's set to where you just see an increase in current draw, that's high enough. If you're concerned if it's enough, you can run a sine-sweep (about 1v into a dummy load, I generally use 4 ohm) to see if it's clean at the 20kHz end of the spectrum.
When the distortion is at its worst, do you have perfectly clean audio going into the differential amplifier of the power amp section?