V
ACUUM TUBE REPLACEMENT
The Premier Ten uses four vacuum tubes, all 6GK5s. This type has
been carefully chosen for its particular circuit application. It is well known
that tubes of a given type vary sonically depending on the manufacturer.
We have chosen the brands of tubes we supply based on extensive
auditioning of available brands with the choices being made solely on
the basis of sonic performance without regard for either cost or prestige.
We know of no vacuum tubes available which will improve the sonic
performance of your Premier Ten. In addition, the tubes in your pream-
plifier have been tempered by a controlled burn-in procedure that
permits them to perform for a greatly extended period without sonic
degradation. We anticipate two to three years of operation without
degradation in normal use. The tubes have also been hand selected to
achieve the minimum residual noise in your preamplifier. Therefore, we
highly recommend that you purchase replacement tube sets from
conrad-johnson design.
Premier Ten Owner’s Manual
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