Hi,

Thats very much true with older caps up to about 1970. But later model
caps don't exhibit this 'memory'.

I'd make that "1950."

There have been alot of improvements in the electrolytes, and now the
caps last virtually forever. But the oxide thickness still determines
the tolerance, and as such it still changes with temperature, age and
voltage. Just not as much as it used to.

Funny, I've measured a dozen caps before and after reforming, new
old stock from 1946 to 1997. Other than the 1946 one, which dropped
from 17 to 12.1 µF, all the others *increased* their capacitance. That
includes ones from 1947, 1962, and 1967.

73, Alan