On Monday, November 21, 2016 at 1:07:20 PM UTC-5, Jeff Liebermann wrote:

In the bad old daze, the electrolytics were running at 60Hz, not
60KHz. The power (heat) dissipated in the electrolytics is a function
of frequency.

They've been using high frequency smps since the late 70s (Sony was the first that I can recall (and boy were they *squirrely*). And while we replaced capacitors on the wholesale level even back then, they didn't bulge. The vented cap syndrome (VCS?) has really only been an issue since about 2004 or so. Around 2008 was the real big explosion of top bulged caps, when we'd see TVs in warranty with bulged/vented caps. There's been a big slowdown in bulged caps in recent years.