V
acuum Tube Replacement
The audio circuit of the PV10A uses five vacuum tubes of three different
types: two 12AX7 (V1 and V2), one 12AT7 (V3) and two 12AU7 (V4 and
V5). The PV10AL uses two type 12AU7 (V4 and V5). 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 PV10A. The tubes in your
preamplifier have been tempered by a controlled burn-in procedure that
permits them to perform 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 accommodate 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:
V1
V2
V3 V4 V5
PV10A Owner’s Manual
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