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SERVICE MANUAL
PROJECT TWELVE

MONO
POWER AMPLIFIER
SPHINX Project Twelve Service Manual
Contents
1. UNPACKING .......................................................................................................................................3
2. SPHINX WARRANTY CARD ..............................................................................................................3
3. CONTACTING THE MANUFACTURER .............................................................................................3
4. THE POWER AMP AT A GLANCE.....................................................................................................4
Front panel................................................................................................................................................... 4
Rear panel ................................................................................................................................................... 5
5. TECHNICAL SPECIFICATIONS .........................................................................................................6
6. GENERAL CHECKLIST......................................................................................................................7
Optical connections ..................................................................................................................................... 7
Switching the amp on................................................................................................................................... 7
Protection mode........................................................................................................................................... 7
Cables.......................................................................................................................................................... 7
7. USING THE AMP WITHOUT PROTECTION CIRCUIT......................................................................8
Removing the protection circuit board ......................................................................................................... 8
Repositioning the protection circuit board.................................................................................................... 8
8. ADJUSTMENT PROCEDURES..........................................................................................................9
Bias.............................................................................................................................................................. 9
Offset ......................................................................................................................................................... 10
Common mode .......................................................................................................................................... 10
9. PROBLEMS AND SOLUTIONS........................................................................................................11
10. DIAGRAMS AND PARTS LISTS ....................................................................................................12
Connection diagram for testing the project 12 ........................................................................................... 13
Schematic layout of project 12 with securityprint ....................................................................................... 14
Schematic layout of all relevant parts ........................................................................................................ 15
Project 12 amplifier diagram ...................................................................................................................... 16
Project 12 protection diagram.................................................................................................................... 17
PCB drawings of Project 12 ....................................................................................................................... 18
Partlist amplifier ......................................................................................................................................... 19
Partlist protection ....................................................................................................................................... 22




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SPHINX Project Twelve Service Manual

The Sphinx Project Twelve design
1. UNPACKING
The Sphinx Project Twelve was designed for the
ever-increasing group of quality-conscious Before leaving the factory every Project Twelve is
audiophiles. subjected to stringent and extensive technical and
We are very proud of the tradition connected with exterior quality inspections. 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 Twelve
service and repair the Sphinx Project Twelve Mono in its original carton.
Power Amplifier.
After unpacking the Project Twelve we therefore
recommend you carefully check it for any transport
The design is based on the long experience of the damage.
Sphinx design team with ultra-wide bandwidth If you find any damage and the product has not
power FETs. been shipped in the original carton the ensuing
These have an unique and extremely wide power repair costs will not be covered by the warranty.
bandwidth exceeding 1.5 MHz, a very high slew
rate of over 100 V/