DIYbanter - View Single Post - Why should someone replace ALL the capacitors on old Tube equipment?

Ralph Mowery

In article om,
says...

On Fri, 03 Feb 2017 13:50:22 +0000, Adrian Tuddenham wrote:

wrote:

Why should someone replace ALL the capacitors on old Tube equipment?

It seems that some people advocate that.

One of the factors that is often overlooked is the tolerance of the
circuit to the various types of wear-out mechanism.

snip

True. But the reason to replace them ALL is that if you only replace the
one(s) causing a problem, another will fail later, then another still
later. It is much easier to do them all at once than to have to repair
the same unit over and over as they fail one after another. Been there,
done that.

I believe in replacing most all the components that are similar when one
fails in older equipment. I worked at a large plant and when a 200 HP
motor speed control went bad a factory man was called in. He found two
power diodes bad. As this was a 3 phase motor and had one more, I asked
him to replace it. He told me they were about $ 100 each. I said go
ahead. The down time was costing us much more than that an hour,and to
get him back in would cost a lot more if the 3 rd one failed, it would
be just good insurance. The diode may or may not have been weakened in
some way. $ 100 is a small part of over $ 50,000 or more.