DIYbanter - View Single Post - My sub-woofer hums...

The Natural Philosopher

wrote:
On 7 Mar, 15:44, Joe wrote:

I don't think 12000 hours is bad for an electrolytic. The old rule
of thumb was seven years, though of course many go far beyond that.
A bit like hard drives.

Where do you get the 7 year rule from, and what exactly is it? I've
never come across it, and if it existed I really ought to know.

I've still got 1930s lytics in service, and IME lytics are a long way
down the list of most likely failures in old equipment. The ida that
lytics have short lives seems to be an offshoot of the spate of bad
caps on mobos in the 90s.

Well I had to fix an old valve radio that was late 50's vintage..that
had packed in its electrolytics after about 40 years.

Lost of valve stuff has that as the single and only real fault.

NT