The automotive use of these new steels is also why reparability is going down. As welding rusted out parts is no longer viable.

The paper writing.
Or even writing it up for my homepage sucks so much.

Dude's looking for capacitor whine

How about recapping your stove?
Because I have done that.

Kester and whatever name Multicore is under now are fine.
I have used them over Chipquik myself.
As for flux, there is also MG Chemicals, which seems more available in some places as well.

Low leakage and low ripple?
We used some medical grade power supplies in things because those had the lowest noise of all the COTS power supplies we could get for the price we wanted to pay.

But the large transformer could be an attempt to meet the medical isolation requirements.
That's my guess.

Is it a Zener and not some TVS diode for ESD protection?

And no, it was not on the first try.

Here's the DUT.

Yeah that seems to be the consensus.
1/4 and 1/3 of them have now been scrapped.
One even gave a "new" CR2032 and holder for it for my RB58vy 4m radio.
The previous one lasted only then years!

What probe are you using?
Some homebrew magnetic pickup?

Here's another angle of it in use.