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How to Reduce Audible Noise in Motor Drive Designs Using GaN Transistors and ICs - YouTube

Here is a white paper on your topic. A lot of engineering jargon but it boils down to the space vector (SV) control scheme reduces acoustical noise compared to constant voltage (CV) or variable voltage (VV) schemes. PWM frequency also play a large part in it as well.

Much of the "noise" from a BLDC type motor is caused by the driver system. The high frequency oscillations to create the rotating field resonated in the stator coils and in the rotor, of which most would make a great bell prior to adding the magnets. Many controllers/drivers even use that...

WHAT??? You don't have a 240 volt 500 amp service to your house (dedicated to just the sound system)?

1,1-difluoroethane (DFE; HFC-152a, Freon® 152a) is used as a propellant in gas dusters, and it is sometimes misused as a recreational “drug” to induce an altered mental state. Yes, I also prefer the doobie and/or Jamesons whiskey.

I assume the "AIR" in a can type. definitely not air. It is a refrigerant.

here is an internal shot I grabbed from Update my Dynaco

Looks like a very nice "tuna" at the bottom of your stack.

Yes I believe it did. I remember seeing it in a service manual for something along those lines.

Saw him in Red Rocks in '21. Phenomenal!

Did you mean to say "aMARXicans"

She's a beauty and a beast Perry!

A pile of wood shavings might negate the value of FR4 just sayin'

They're lucky they didn't get a face full of copper and plastic bits.

If it is really AC the rectifier is shorted, if pulsed DC filter caps are shot. Of course as already stated some outputs are kaput as well.

You are very generous Perry.

I used to do full board through hole soldering on assemblies that were roughly 2.5" x 6" by dipping the solder side in molten solder heated in a cast iron griddle on top of a hot plate. It was a fairly congested board, a lot of 0.1" pitch chips and close traces. Ss long as the flux and temp...

And Bob Ludwig mastered "Brothers in Arms" - Dire Straits

Probably among three of the best mastered LP's I have. Exquisite quality recording.

Here you are sir.