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More info?)
Brendan, I've bought three U 87s on eBay without any horror stories to
tell, but it's important to be choosy as to who you are buying from. A
seller with a very high feedback percentage (and 100% is thoroughly
possible) will be keenly interested in avoiding any negative feedback,
especially on a major sale. I wouldn't even give a second glance at an
auction if the seller's feedback isn't 100% or very close to it. You
can (and in my opinion should) also view a seller's complete feedback
record. If the seller has a few "neutrals" or "negatives" you can
decide whether you think they were fair or not.
As far as the merchandise is concerned, one thing to be aware of is
that there have been two basic models of the U 87. One (the "U 87") was
made from 1967 through 1986, when the newer model ("U 87A") was
introduced. The newer model has 6 dB lower equivalent noise, plus
almost 11 dB higher output levels (sensitivity). The only disadvantage
of the newer model is that its sound pressure level limit is 5 dB lower
(ca. 117 dB SPL rather than 122).
Not every eBay ad is clear or even correct in stating which of these
two models is for sale. (Additional letters such as "i" "p" or "mt"
refer to other details, and don't affect which model is which.) Very
often, sellers refer to the U 87A simply as a U 87 and I have also seen
the reverse! Also, sellers often seem to copy the specs from Neumann's
Web site--which naturally only lists the specs for the current model.
Be aware also that the original type of U 87 was sometimes sold with a
large Tuchel connector rather than the now-standard XLR-3M. If you're
buying a "non-A" U 87, make sure which connector type it has, since
some sellers actually conceal this in their photos (!).
In terms of microphone condition: The most crucial, most vulnerable,
and hardest-to-evaluate-over-the-Internet part of the microphone is its
capsule. U 87 capsules cost nearly $800 to replace. As I said, my U 87s
were OK but earlier in my eBay "career" I bought two U 89s, both of
which turned out to need capsule replacements, and I was the one who
had to pay. Fortunately those capsules aren't quite as expensive but as
I said, you need to be careful whom you buy from and on what terms.
One thing to consider is that Neumann USA (assuming you're in the USA)
will inspect a Neumann microphone for (I believe) $70. It's not a bad
idea to send them any used U 87 that you buy anyway--maybe you can get
the seller to agree that if Neumann says that repairs are needed, the
seller will either pay for them or cancel the sale and refund your
money.
This is all I can currently think of--feel free to post any specific
questions that you may have.
--best regards