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.
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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