Tube Installation Procedure; Installation Instructions; Power-Up Procedure; Shut-Down - Audio Research Reference CD8 Owner's Manual

Model Reference CD8

Tube Installation Procedure

BEFORE OPERATING THE CD8:
Carefully remove each of the six vacuum tubes (five 6H30,
one 6550C) from their protective foam blocks and install
them in their sockets on the circuit board, matching the "V"
number on the tube with each matching numbered tube
socket. The 6550C is mounted horizontally in the socket on
the metal bracket.
When installing or removing the 6550C vacuum tube in
the V5 socket location, grasp the metal bracket with one
hand while inserting the tube with the other to prevent
flexing of the circuit board and possible damage to it.
Note: double damping rings are installed at the factory on
each 6H30 tube for maximum sonic performance.

Installation Instructions

While the CD8 does not dissipate an unusual amount of
heat, it is important that it be provided with reasonable air-
flow to assure long, trouble-free operation. In addition, the
following installation guidelines will help insure maximum
sonic performance as well as reliable service.
1. Upright and level horizontal mounting is mandatory,
preferably on solid, non-resonant shelving. Allow suffi-
cient space for tube convection cooling. Do not block
the ventilation holes when the unit is turned on.
2. Do not stack the CD8 on top of another component: not
only could this cause overheating, but hum may be
introduced into the system.
3. Do not place any objects on top of the CD8; its suspen-
sion feet are tuned for the specific weight of the CD8.
4. Do not place or operate your CD8 on a soft or
irregular surface such as a rug. This can prevent proper
leveling and restrict ventilation
5. Do not operate your CD8 without the top and bottom
covers installed. These are required both for safety
as well as shielding from interference (except in service
operations by qualified personnel).
6. If side-by-side mounting with other equipment is
employed, place the CD8 to the left of the other chassis,
so as to provide maximum spacing between the trans-
formers of the CD8 and the other component.

Power-up Procedure

Once plugged into the power receptacle, after the tubes
have been installed (see above), push the front panel Power
switch to turn on the CD8. The central green front panel
LED will glow dimly for about a 40 second circuit warm-up
interval with the output automatically muted. When the
LED glows brightly, the CD8 is ready for operation.
Once powered up and operational, with the CD door fully
closed, the unit will default to the operate setting (display,
transport and front panel controls are activated).
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Ref CD8 PDF Manual / 13-08 /
Because the CD8 reaches its full sonic potential from "cold"
in a shorter warm-up time period than a solid state
CD player, it's recommended that it be powered off for any
extended time it is not in use. This will save on tube life.

Shut-Down

1. Set preamplifier Mute switch to "Mute" position.
2. Press CD8 front panel Power switch to turn unit off.

Front Panel Control Functions

POWER O: The Power switch turns the CD8 completely on
for operation (indicated by the LED being brightly lit), each
time preceded by a warm-up interval of about 40 seconds
when the LED is dim and the output is automatically
muted. Press power switch again to turn CD8 off-indicated
by unlit LED.
PAUSE : Interrupts play (display will read "PAUSE").
Release PAUSE by pressing it a second time to resume
playing disc.
STOP : Stops play. (Number of tracks and total disc track
time appear on display.)
:
PLAY Starts play. CD door must first be fully closed.
Begins to play first track unless another is selected. Restarts
track if pressed during play. (Track number and elapsed
track time appear on display.)
n
|
:
PREV Selects the previous track to play. Continue
pressing to cycle backward through previous tracks. (Track
number will appear on display.)
| :
NEXT Selects the next track to play. Continue pressing
to cycle forward through tracks. (Track number will appear
on display.)

Remote Control Functions

The remote control unit includes all of the above described
CD8 front panel control functions plus the following
additional functions. (Functions in [ ] indicate labeling
abbreviations appearing on remote control unit.)
STANDBY [STBY]: Press to stop play, turn off display and
deactivate transport operation. As indicated by lit green
LED, power remains on to all vaccum tubes in audio section
and power supply. Press again to light display and reacti-
vate transport functions.
0-9 BUTTONS: Pressing numbered button(s) corresponding
to the disc track number will advance disc to desired track.
Also used to select tracks when compiling a custom disc
playback program (see PROGRAM [PROG] function descrip-
tion below).
SCAN: With a stopped CD and the CD door closed, press
SCAN and the first 10 seconds of each track will be played
in sequence. ("SCAN" will light up on display, then 10
seconds are counted out next to each track number.) To
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