Conrad-Johnson LP260m mono-
block power amplifier Owner’s Manual
6
Vacuum Tube Replacement
The LP260m mono-block power amplifier uses ten vacuum tubes
of three different types: one type M8080 (V1), one type 6N30P
(V2), and eight type KT120 (V3 through V10). 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
LP260m mono-block power amplifier. 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 amplifier is
switched off when not in use. If it is left on at all times, tube life can
be exhausted in a matter of a few months.
The LP260m mono-block power amplifier has been designed to
make tube replacement as simple as possible. Because the output
tubes are individually biased, replacement tubes need not be
matched pairs. No a-c balance adjustment is necessary. It is
necessary to re-bias the amplifier when the output tubes are
replaced. The LP260m mono-block power amplifier has built in
bias indicators so that no instruments are required to make this
adjustment.
