Audio Research HIGH DEFINITION PH9, Manual

Page: 6 / 22

6
Before operating the PH9
Your PH9 preamplifier is shipped with the
vacuum tubes packed in a separate foam-
lined carton. These must be unpacked
and installed before you attempt to
operate the phono preamplifier. Included
are three 6H30 tubes for the analog
stage, and a 6H30 and 6550WE used in
the power supply. Proceed according
to the following instructions.
Installation
Remove all screws fastening the top cover.
Carefully remove each vacuum tube
from its protective foam and match its
location ‘V’ number (written on the base
of the tube) to the ‘V’ number printed
next to each socket on the circuit board.
Firmly seat each tube in its matching
socket, taking care to ‘key’ the tube pins
to the socket holes. Retain the tube
carton with other packing materials
for possible future use. Refasten the
top cover on the phono preamplifier.
V1
V2
V3
V4
V5