VAC Standard Mk II Preamplifier User Manual
Page 8
Page 8
GENERAL INFORMATION ABOUT TUBES
It is a truth that each brand of tube sounds different in a particular high resolution circuit.
This is because no two manufacturers make a tube type in quite the same way, and the
central tendencies of the performance parameters will differ slightly with each maker. This
sonic variability may at first seem a liability, but further thought will reveal that it is an
advantage. The owner of a tube amplifier can select those tubes which sound like the real
thing in his/her specific system. VAC can recommend the best tubes for your amplifier.
The tube types used in this component should last for 8,000 to 15,000 hours of use (two to
ten years for most users). There are always occasional exceptions, long or short. If you have
to replace a tube before, say, 3,000 hours, just replace the single tube. If you have to replace
a tube at 8,000 hours, replace them all and keep those still functioning well as spares
VAC will be happy to test tubes for concerned customers.
WARRANTY
Your equipment is warranted for a period of thirty (30) days from the date of purchase.
In addition, if the registration form is received by VAC along with a copy of your sales
receipt from an authorized VAC dealer within this thirty days, a service contract will be
extended to cover your equipment for three (3) years (tubes excepted).
This warranty applies only to units sold in the United States of America through authorized
VAC dealers, and operated within the U.S. by the original purchaser. It covers factory
service, and, in the continental U.S., standard return shipping. For warranty information
outside of the U.S. contact the importer of VAC equipment for your country. Units sold
outside of the U.S. should still be registered with VAC. It is the responsibility of the dealer
and/or customer to determine the suitability of this product for any particular application.
Your questions and comments are always welcome. Contact:
Valve Amplification Company, Inc.
1911 East Avenue North
Sarasota, FL 34234
Telephone
941 952 9695
Facsimile
941 952 9691