Tube Installation Procedure; Installation Instructions; Power-Up Procedure; Shut-Down - Audio Research Reference CD7 Owner's Manual

Model Reference CD7

Tube Installation Procedure

BEFORE OPERATING THE CD7:
Carefully remove each of the seven 6H30 vacuum tubes
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. Note:
double damping rings are installed at the factory on each
tube for maximum sonic performance.

Installation Instructions

While the CD7 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 CD7 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 CD7; its suspen-
sion feet are tuned for the specific weight of the CD7.
4. Do not place or operate your CD7 on a soft or
irregular surface such as a rug. This can prevent proper
leveling and restrict ventilation
5. Do not operate your CD7 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 CD7 to the left of the other chassis,
so as to provide maximum spacing between the trans-
formers of the CD7 and the other component.

Power-up Procedure

Once plugged into the power receptacle, after the tubes
have been installed (see above), push the Power switch to
turn on the CD7. 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 CD7 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).
Because the CD7 reaches its full sonic potential from "cold"
in a shorter warm-up time period than a solid state CD
player, it is recommended that the CD7 be powered down
for any extended time it is not in use. This will save on
tube life.
2

Shut-Down

1. Set preamplifier Mute switch to "Mute" position.
2. Press CD7 Power switch to turn off .

Front Panel Control Functions

(Functions in [ ] indicate labeling abbreviations appearing
on remote control unit.)
POWER O: The Power switch turns the CD7 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 mut-
ed.
PAUSE II : 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.)
l
:
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.)
l
| :
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
CD7 front panel control functions plus the following
additional 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
hear a track in full that player is presently scanning, press
SCAN button again which will cancel SCAN function.