There are "traps for young players"!
Back in the early/mid 1990s, I had occasion to repair a number of "Electrohome"black & white TV picture monitors.
Most of the faults were relatively easy, including the one I'm going to describe.
The monitor had collapsed vertical scans, the classic cause of which was failure of a power supply, of around +150v derived from an overwind on the horizontal output transformer.
The line rate voltage from the winding was half wave rectified, then filtered with a single non-polarised (NPB) electrolytic cap.
There was a bit of extra circuitry hanging off this circuit which apparently demanded an NPB cap (which was not remarked as anything special, either on the cap, the schematic, or elsewhere).
Being pre-Internet, I looked up the "X-On" catalogue, & sure enough, "front & centre" was what looked like a suitable type of non polarised electrolytic.
They were much smaller than the clunky EHome one, but they tended to use clunky parts, anyway, so marvelling at the advances in Technology which had delivered such a size reduction, I ordered some.
On arrival, I fitted one, & up came the monitor with normal height----for all of 10 seconds, then the picture collapsed & the magic smoke emanated from the cap.
It turned out the "clunky" cap was a low ESR non polarised electro.
Such was unobtainium, so the monitor returned to service with a "Christmas tree" of Mylar greencaps
Ugly?-------Yes,
Functional?-----Oh, Yeah!
PS:- Such supplies had another "sting in the tail".
The silicon rectifiers look like a "bog-standard" package, so it is tempting to replace faulty ones with 1N4007's or the like, which also give up their magic smoke, as the rectifiers must be fast recovery types.