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ESQ is not so much a different range, more a way of achieving
the best from today's factories.
Every ESQ valve is specially selected, undergoes rigorous
testing and comes fully documented, complete with test parameters
and the response curves. Most types, subject to availability,
can be ordered as ESQ, but it is particularly relevant to
matched power tubes, pairs, quartets and even octets.
Every ESQ valve is of course fully guaranteed and that includes
matching, where appropriate.
Obviously you would expect a valve with this pedigree to be
well presented, every valve carries the ESQ gold plaque, and
is presented in its own sealed packaging.
NOS standards from NCP (new current production)
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