Conrad-Johnson ART
108
A Amplifier Owner’s Manual
6
Vacuum Tube Replacement
The ART
108
A Amplifier uses
eleven
vacuum tubes of two
different types: three type 6922 (V1, V2, V3,) and
eight
type
KT88
(V4
-V11
)
.
The
ART
108
A
amplifier
was
designed
exclusively for the
use of KT88’s. We know of no vacuum tubes
available which will improve the sonic performance of your ART
108
A Amplifier.
Note:
To maintain performance and reliability, KT88
output tubes for the ART
108
A must be replaced with
matched
quads
selected for use with this amplifier
.
We
highly recommend that you purchase replacement tubes from
conrad-johnson design.
We anticipate tube life to accommodate two to three years
of operation without degradation in normal use
-
the amplifier
should be
switched off when not in use.
The ART
108
A Amplifier has been designed to make
tube replacement as simple as possible. No a-c balance
adjustment is necessary. It is necessary to re-bias the amplifier
when the output tubes are replaced. The ART
108
A Amplifier
has built in bias indicators so that no instruments are
required to make this adjustment.
