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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

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