ACCUPHASE LABORATORY, INC.
2-14-10, SHIN-ISHIKAWA, AOBAKU, YOKOHAMA 225-8508, JAPAN
H101X
820-3143-30（B1） Printed in Japan
AD-9 / AD-10
Analog Disc Input Board
INSTRUCTION MANUAL
Thank you for selecting the Accuphase AD-9, AD-10 Analog Disc Input Board. This option
board is designed for installation in one of the option slots on the rear of an Accuphase
component. It provides a set of inputs for signals from an analog record player.
Usage details of the board will differ, depending on the Accuphase component in which the
board is installed. To ensure correct use, please read this document first and then refer to the
instruction manual of the Accuphase component for additional information.
＊
The board conforms to the AAB (Accuphase Analog Bus) interface standard.
LEFT, RIGHT analog record player input jacks
Connect the output cable from the analog record player to these
jacks.
GND terminal
Connect the ground cable that emerges from the analog record
player to this terminal.
●
1
S1, S2: MM/MC equalizer gain selector
＊
Install the board in any empty slot.
Usage
＊
This switch affects both the left and right channels.
As a general guideline, set this switch as follows:
For MC cartridges with internal impedance of 20 ohms
or more: 100 ohm position
For MC cartridges with internal impedance of less than
20 ohms: 30 ohm or 10 ohm position
＊
This switch affects both the left and right channels.
●
2
S3: MC input impedance selector
Installation
Set the power switch of the Accuphase compo-
nent to OFF.
On the rear panel, loosen the two screws at the
top and bottom and remove the panel covering one
option slot (see Figure 1).
Insert the option board by sliding it into the top
and bottom guide rails of the slot (see Figure 2).
When the board touches the internal connector,
give it a slight push until the board is firmly seated.
(The board must be flush with the panel.)
Secure the board with the two screws at the top
and bottom.
2
1
3
4
＊
The illustration shows the E-250.
This filter has a cut-off frequency of 25 Hz and a steep
attenuation slope of -12 dB/octave. lt cuts off unwanted
subsonic signal components without affecting the audible
range.
＊
Set both switches to the same position.
●
3
S4, S5: Subsonic filter on/off
AD-9
AD-10
DIP switches S1, S2, S3, S4, S5
Set these switches to the required positions before inserting the board.
Note:
Use a sharp pointed object to move the switch levers and make sure that the levers are set fully
to one side. If a lever is set only half-way, correct operation is not possible.
AD-10
AD-9
Component side
S1
S3
S2
S4
S5
1
ON
2
3
4
1
ON
2
3
4
1
ON
23
4
1
ON
23
41
ON
23
4
The illustration shows the position of switches S1 - S5 on the board.
The switch position is identical for the AD-9 and AD-10.
●
1
S1, S2: MM/MC selection
●
2
S3: Input impedance selection
for MC: 10/30/100 ohms
●
3
S4, S5: Subsonic filter ON/OFF
Caution
●
Before inserting or removing an option board, be sure to turn the power of the
Accuphase component off to prevent the risk of damage.
●
Tighten the two fastening screws firmly. If the screws are not properly secured,
ground connection will be impaired and damage may occur.
Caution
Do not touch circuit components, solder areas, or exposed parts of connectors,
to prevent possible damage and contact problems. Hold the board only at the
PCB edges or the rear panel.
Factory default
setting
1, 2, 3, 4 : OFF
1, 2, 3, 4 : ON
OFF
ON
1
ON
2
3
4
1
ON
2
3
4
MM:
Use this position for moving magnet cartridges with high output
Gain: 36dB
Input Impedance : 47 kohms
MC:
Use this position for moving coil cartridges with low output
Gain : 62dB
Input Impedance : As selected with S3
●
Generally, the input impedance setting should be
about 2 to 3 times the rated cartridge impedance.
However, since the requirements of some car-
tridges may vary, the final setting should be deter-
mined by ear.
Factory default
setting
1, 2, 3, 4 : OFF
3, 4 : OFF
1, 2 : ON
3, 4 : ON
1, 2 : OFF
100Ω
30Ω
10Ω
1
ON
23
4
1
ON
23
4
1
ON
23
4
Factory default
setting
1, 2, 3, 4 : OFF
1, 2, 3, 4 : ON
MM
MC
1
ON
23
4
1
ON
23
4
Fig. 1
Fig. 2
Guide rail
Guide rail
Sub
panel
Option
board
72
4-0
01
9-0
0
72
4-0
02
0-0
0
TOSH
IBA
74HC
TO
NFV
510
20MHz
0.24
