V
acuum Tube Replacement
The Premier Fifteen circuit employs eight vacuum tubes, six 12AX7s
and two 6GK5s. The brands of tubes we supply have been chosen by
first selecting those brands which are known to be most reliable, then
by extensive auditioning of these acceptable brands with the final
choices being made solely on the basis of sonic performance. We know
of no vacuum tubes available which will improve the sonic performance
of your Premier Fifteen. The tubes in your preamplifier have been
tempered by a controlled burn-in procedure that permits them to per-
form for a greatly extended period without sonic degradation, then
selected for minimum residual noise. Replacement tubes are prepared
and selected in the same way. Therefore, we highly recommend that you
purchase replacement tube sets from conrad-johnson design.
We anticipate tube life to accomodate two to three years of operation
without degradation in normal use - if the preamplifier is switched off
when not in use. If the preamplifier is left on at all times, tube life can be
exhausted in a matter of a few months.
Tube Chart:
V3 V4
V1 V2
V8 V7
V6 V5
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Premier Fifteen Owner’s Manual
9
Summary of Contents for PREMIER 15
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