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SERVICE MANUAL

PROJECT TEN

INTEGRATED
STEREO AMPLIFIER
SPHINX Project Ten Service Manual
1. UNPACKING .......................................................................................................................................3
2. SPHINX WARRANTY CARD..............................................................................................................3
3. CONTACTING THE MANUFACTURER.............................................................................................3
4. THE AMP AT A GLANCE ...................................................................................................................4
Front panel................................................................................................................................................... 4
Rear panel ................................................................................................................................................... 5
5. SPHINX REMOTE CONTROL ............................................................................................................6
Buttons and LED indication.......................................................................................................................... 6
Operation ..................................................................................................................................................... 7
Selecting without switching .......................................................................................................................... 7
Batteries....................................................................................................................................................... 7
Encountering problems... ............................................................................................................................. 7
6. TECHNICAL SPECIFICATIONS.........................................................................................................8
7. GENERAL CHECKLIST .....................................................................................................................9
Protection modes ......................................................................................................................................... 9
Short Circuit............................................................................................................................................. 9
Standby mode.............................................................................................................................................. 9
Necessary Equipment.................................................................................................................................. 9
8. ADJUSTMENT PROCEDURES........................................................................................................10
Bias............................................................................................................................................................ 10
Offset ......................................................................................................................................................... 11
9. PROBLEMS AND SOLUTIONS .......................................................................................................12
10. DIAGRAMS AND PARTS LISTS....................................................................................................13
Connection diagram bias adjustment......................................................................................................... 14
Connection diagram offset adjustment....................................................................................................... 15
Connections main board and display board of Project 10.......................................................................... 16
General overview Project 10 ...................................................................................................................... 17
Project 10 power supply and input selection .............................................................................................. 18
Project 10 volume board ............................................................................................................................ 19
Project 10 amplifier left .............................................................................................................................. 20
Project 10 amplifier right ............................................................................................................................ 21
Project 10 control ....................................................................................................................................... 22
PCB drawings of Project 10 ....................................................................................................................... 23
Parts list ..................................................................................................................................................... 24

2
SPHINX Project Ten Service Manual

The Sphinx Project Ten design 1. UNPACKING
The Sphinx Project Ten was designed for the ever- Before leaving the factory every Project Ten is
increasing group of quality-conscious audiophiles. subjected to stringent and extensive technical and
We are very proud of the tradition connected with exterior quality inspection. This ensures the user
the SPHINX name, especially concerning audio many years of high quality audio from a perfect-
quality perfection. looking product.
This service manual will help you to optimally We recommend owners to ship the Project Ten in
service and repair the Sphinx Project Ten its original carton.
Integrated Stereo Amplifier
After unpacking the Project Ten we therefore
This integrated high-end stereo amplifier is of recommend you carefully check it for any transport
exceptional quality. With exception of the balanced damage.
input section, it is of discrete design throughout (no If you find any damage and the product has not
IC's are used). The pre-amp section is built around been shipped in the original carton the ensuring
Dual FET's and the amplifier is DC-coupled from repair costs will not be covered by the warranty.
input to output.
The two mono power amps (each channel is totally
independent) use special power transistors with a 2. SPHINX WARRANTY CARD
power bandwidth of over 20 MHz, a very fast slew To be entitled to any warranty repairs the owner
rate and an unsurpassed phase linearity over the must have send the filled out warranty card to
power bandwidth. The amplifiers are therefore very Sphinx or a distributor where it has been registered.
stable and can effortlessly drive every type and Other regulations may apply in your specific
format of loudspeaker (even the most complex ones country: when in doubt, please consult the proper
such as electrostatic and magnetostatic...) at authorities.
maximum quality.
All internal audio cabling is Siltech pure silver and
the amp outputs are sent to the loudspeaker
connectors via heavy duty, completely sealed gold- 3. CONTACTING THE MANUFACTURER
plated relays. In case of any problem not covered in this manual
or if you have other questions you may contact the
To obtain the maximum quality from this integrated Sphinx International Service Department in The
amp it is necessary for it to be properly aligned and Netherlands (local time: GMT +1h) during office
to be used with top quality audio components, hours at the following numbers:
preferably other Sphinx components.
Telephone (+31) 35 602 0302
Fax (+31) 35 602 2806
Please also refer to the User Manual of the E-mail [email protected]
Project Ten for information about functions
not described in this manual. It is always very helpful and efficient if you have all
It is important to familiarise yourself with the relevant information about the specific product and
special functions, operation and possibilities the problem ready.
of the Sphinx Project Ten.

3
SPHINX Project Ten Service Manual

4. THE AMP AT A GLANCE

Front panel
1
4

6
9

2 3 8

1. VOLUME: With this motor-controlled knob you 2. STANDBY: To switch the component on and off.
may adjust the volume of the loudspeakers. When the component is 'off' (standby) this is
The volume can be controlled manually or via the indicated by the red LED.
optional Remote Control. When the component is active the LED will be
green.
3. MUTE: Press this button to temporarily mute the
sound. The red LED will light.
4. CD: To select the CD input.
5. TUNER: To select the TUNER input.
6. LINE 1: To select the LINE 1 input.
7. LINE 2: To select the LINE 2 input (cinch or
balanced).
8. TAPE MON: To select the TAPE IN input.

As soon as you have pressed one of the buttons
5. to 9. the corresponding red LED next to it will
light.
9. PHONES: To connect dynamic stereo
headphones.

4
SPHINX Project Ten Service Manual

Rear panel

14 20

15 16 17 18 19 21 22
23 24 25 26

11. ON/OFF: This is the mains power switch. 18. BALANCED LINE 2 RIGHT: To connect the
XLR signal cable (balanced cable) from the right
12. Fuse holder: Contains a fuse (3.15 A slow).
output of the signal source for Input 2.
13. AC Power: Connect the mains cable to a mains 19. BALANCED LINE 2 LEFT: To connect the XLR
power outlet (230 - 240 VAC). signal cable (balanced cable) from the left
14. CONTROL OUT: To connect the optical cable output of the signal source for Input 2.
going to another Sphinx component. 20. CINCH/BALANCED: This switch is to select the
15. RIGHT OUTPUT: To connect the cable from the input connector for LINE 2:
right loudspeaker: out LINE 2 (cinch)
red + in BALANCED LINE 2
white - 21. LINE 2: To connect the cinch signal cable from
16. LEFT OUTPUT: To connect the cable from the the signal source for LINE 2.
left loudspeaker: 22. LINE 1: To connect the cinch signal cable from
red + the signal source for LINE 1.
white -
23. TUNER: To connect the cinch signal cable from
17. Manufacturer's label: This shows important
the tuner.
data for the component, such as serial number
and mains power voltage. 24. CD: To connect the cinch signal cable from the
CD player.
25. TAPE IN: Connect this input to the output of the
recorder.
26. TAPE OUT: Connect this output to the Input of
the recorder..

5
SPHINX Project Ten Service Manual
5. SPHINX REMOTE CONTROL

This single Sphinx Remote Control lets you control
all functions: not only of the Project Ten, but of all
other Sphinx equipment.

Only the following buttons and indications on the
Remote apply to the Project Ten (the others will not
function):

Buttons and LED indication
1. PRE-AMP: To select the amp. All buttons
pressed hereafter will only control the amp
functions.
The buttons TUNER and CD will have no effect
on the amp.
2. STANDBY: Use this red button to switch the
Project Ten to stand-by.
3. : Pressing this green button mutes the
outputs (temporarily) and you will not hear any
sound. The red LED will be illuminated. Another
press on this button un-mutes the outputs
4. TAPE/MONITOR: Use this button to select the
Tape IN input. Pressing this button has the
same effect as pressing the TAPE button on the
front panel.
Note: The LED of the selected input (see 5.) will
remain illuminated.
5. 1 - 4: To select inputs CD to Line 2 .
1 CD
2 Tuner
3 Line1
4 Line 2
6.

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