I was once buying some 2114s from Jameco and got a
bad
batch. I contacted them and they told me how they work.
First, if it is known to be pulls, they state that up front.
Most of the older chips are from stock rooms of companies
that are clearing older stock or have gone out of business.
As such, the parts are untested. They could have been bad
parts from a production line that someone was collecting
or just some NOS. They have no way to test them.
Just my two cents: I would generally rather have pulls, than
new or old stock of unknown origin.
The pull was likely taken from a working system. The old stock of
unknown origin..., well, who knows? After the electrolyte
debacle of a few years back I am much more picky about
electrolytics (known brand, known lot and
manufacture date, and especially traceable lineage
back to manufacturer as a result of counterfeiting)
than with semiconductors!
I generally expect a "usual distributor" (e.g. not Jameco) to
be selling me new good stuff with paperwork and packaging
traceable back to the manufacturer. Jameco... well they're
many steps up from Poly Paks in quality and customer service
but still I order a couple of spares :-).
Tim.