I'm assuming that's on the amp, not on the power supply.
It cleaned it up significantly but it may not have been effective for the amp's power supply because there is an inductor in series between the terminals and the power supply.
Post a photo of the voltage on the primary center tap of the power supply transformer. Set the scope to 5v/div, 2ms and DC coupling. Take the photo when the supply is squealing.
It cleaned it up significantly but it may not have been effective for the amp's power supply because there is an inductor in series between the terminals and the power supply.
Post a photo of the voltage on the primary center tap of the power supply transformer. Set the scope to 5v/div, 2ms and DC coupling. Take the photo when the supply is squealing.
ground on neg terminal probe on gold windings on right side by yellow cap in previous photo
with scope setting you suggested
with scope setting you suggested
To what?
In the future, for ALL scope images, include the timebase and vertical amp settings as well as the point where the probe was placed.
In the future, for ALL scope images, include the timebase and vertical amp settings as well as the point where the probe was placed.
Check it again. You don't have to post an image, just find the settings that give the same number of pulses (when properly triggered) on the display. The power supply could be oscillating at the wrong frequency.
That's extremely low. It appears to be about 800hz. Do you have a multimeter that can measure frequency?
Place the black probe on the amp's ground terminal and the red probe on the gate resistor. What frequency do you read?
That's about what I'd expect. Maybe a bit low but not as bad as what it appeared to be.
On your scope, was the x5 knob pulled out?
Was the var knob below the timebase sett to the fully clockwise position?
Does the timebase knob stop precisely on the last marking both clockwise and counterclockwise?
On your scope, was the x5 knob pulled out?
Was the var knob below the timebase sett to the fully clockwise position?
Does the timebase knob stop precisely on the last marking both clockwise and counterclockwise?
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