SPHINX Project Twelve Service Manual
3
The Sphinx Project Twelve design
The Sphinx Project Twelve was designed for the
ever-increasing group of quality-conscious
audiophiles.
We are very proud of the tradition connected with
the SPHINX name, especially concerning audio
quality perfection.
This service manual will help you to optimally
service and repair the Sphinx Project Twelve Mono
Power Amplifier.
The design is based on the long experience of the
Sphinx design team with ultra-wide bandwidth
power FETs.
These have an unique and extremely wide power
bandwidth exceeding 1.5 MHz, a very high slew
rate of over 100 V/µs and an unequalled perfect
phase linearity over the complete frequency
bandwidth.
Six of these 100 W FETs are used to obtain
maximum reliability.
The extremely low output impedance results in a
damping factor of over 600!
Together with the very 'heavy' power supply and its
large energy buffer of 26,920 µF, this results in an
effortless sound with a very large dynamic range
and an unsurpassed transient response.
Much attention has also been paid to the physical
layout, the positioning of components and the
internal grounding. This results in an equivalent
input noise value of <1 µV (<-120 dBV): remarkable
for a pre-amp, but really astounding for a big power
amp with two transformers.
All of this means that the Project Twelve can work
with all kind of loads from every loudspeaker: even
the most difficult ones like electrostatic and
magnetostatic...
To obtain the maximum quality from this power amp
it is necessary to use it with top quality audio
components preferably with other Sphinx
components.
1. UNPACKING
Before leaving the factory every Project Twelve is
subjected to stringent and extensive technical and
exterior quality inspections. This ensures the user
many years of high quality audio from a perfect-
looking product.
We recommend owners to ship the Project Twelve
in its original carton.
After unpacking the Project Twelve we therefore
recommend you carefully check it for any transport
damage.
If you find any damage and the product has not
been shipped in the original carton the ensuing
repair costs will not be covered by the warranty.
2. SPHINX WARRANTY CARD
To be entitled to any warranty repairs the owner
must have send the filled out warranty card to
Sphinx or a distributor where it has been registered.
Other regulations may apply in your specific
country: when in doubt, please consult the proper
authorities.
3. CONTACTING THE MANUFACTURER
In case of any problem not covered in this manual
or if you have other questions you may contact the
Sphinx International Service Department in The
Netherlands (local time: GMT +1h) during office
hours at the following numbers:
Telephone (+31) 35 602 0302
Fax (+31) 35 602 2806
E-mail audionl@euronet.nl
It is always very helpful and efficient if you have all
relevant information about the specific product and
the problem ready.
Please also refer to the User Manual of the
Project Twelve for information about
functions not described in this manual.
It is important to familiarise yourself with the
special functions, operation and possibilities
of the Sphinx Project Twelve.
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