On Tue, 28 Aug 2018 11:07:13 -0400, Ralph Mowery wrote:

If I am doing things for myself, I may do anything to get equipment
going. If I were doing things for others, it would be with good parts.
Like the time at work an outside repair person came in to repair a 3
phase motor drive unit. He found 2 out of 3 diodes bad. I told him to
replace the 3 rd one. It may have been under stress or not. He said
they were $ 200 each. Told him it costs us $ 1000 or more per hour
while that equipment was down, so $ 200 is good insurance it will not
quit in a short time.
That 3 rd diode would probably last , but why take a chance at those
rates.

And that is the very core of this issue: economics. As a hobbyist, I'm
only fixing up my own stuff and if it goes wrong again in a couple of
years owing to the NOS parts I used having failed - I don't believe they
will for a moment but simply for the sake of argument - then it's no big
deal at all for me.
It's a totally different story for professional repairers who would be
foolish indeed to install anything other than good quality new parts from
a reputable supplier. Sure it costs more, but for a pro, it's well worth
it for all sorts of reasons.



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