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SPHINX

 Myth 11                   Service Manual

 3

  

The Sphinx Myth 11 design

This service manual will help you to optimally
service and repair the Sphinx Myth 11 Stereo
Power Amplifier.

This high quality high end stereo power amp is of
discrete design throughout (no IC's are used).

The power amp uses specially selected Power
MOS-FETs with a power bandwidth of over 20 MHz,
a very fast slew rate and an unsurpassed phase
linearity over the power bandwidth. Each channel
uses four 120W/10 A FETs, operates as a pure
voltage source with an extremely low impedance
and is thus very stable.
The most unique feature is that it works in full
Class-A mode up to 10 W!
Thanks to the generous energy reserve of 69,600
µF, unlimited power is available for the largest
signal peaks.

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 Myth 11 is
subjected to stringent and extensive technical and
exterior quality inspection.
This ensures you will enjoy many years of high
quality audio from a perfect-looking product.

Attention: The power amp weighs over 10 kg!
Never lift it out of the box without someone
helping you.

After unpacking your Myth 11 we therefore
recommend you carefully check it for any transport
damage.

Even if the component is in perfect condition you
should still keep the packing materials. If you need
to transport your Myth 11 at a later time it will be
best protected by the original packing materials.

2. 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:

Phone:

(+31) 35 602 0302

Fax:

(+31) 35 602 2806

E-mail:

[email protected]

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
Myth 11 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 Myth 11.

Summary of Contents for MYTH 11

Page 1: ...1 SERVICE MANUAL MYTH 11 STEREO POWER AMPLIFIER POWER STANDBY PROTECT...

Page 2: ...Rear panel 5 4 OPERATION 6 Power on 6 Power off 6 5 TECHNICAL SPECIFICATIONS 7 6 ADJUSTMENT PROCEDURES 8 Bias 8 Offset 8 7 PROBLEMS AND SOLUTIONS 9 8 DIAGRAMS AND PARTS LISTS 10 Measurement Set up 11...

Page 3: ...exterior quality inspection This ensures you will enjoy many years of high quality audio from a perfect looking product Attention The power amp weighs over 10 kg Never lift it out of the box without...

Page 4: ...h the component on and off 2 POWER LED Indicates the selected function stand by off amp on red 3 STANDBY LED Indicates the selected function stand by red amp on off 4 PROTECT LED Normally off When bli...

Page 5: ...label This shows important data for the component such as serial number and mains power voltage 6 OUTPUT L To connect the cable from the left loudspeaker red black 7 AC POWER Connect the power amp to...

Page 6: ...y it considerably increases the life span of the component Switch the Myth 11 on with the STANDBY button the LED 3 will extinguish and the POWER LED 2 will light If you activate the power amp for the...

Page 7: ...90 dB 1 20 000 Hz Slew rate 100 V s Damping factor 500 1 1 000 Hz Input Cinch unbalanced level nominal 1 25V 1 9 dBV Impedance 20 k Supply capacitance 26 000 F total per channel Power consumption 550...

Page 8: ...ntil the level is 8 mV Repeat this procedure after 20 minutes to finalise the adjustment Switch the oscillator on and set it to 1 kHz and a level of 0 dBV 1 V Check the distortion with a THD analyser...

Page 9: ...ease also send by fax or e mail the specific information to the Sphinx International Service Department see page 3 this info can then be added to the general database to aid others Problem Cause Solut...

Page 10: ...mplete set of schematic drawings including the associated parts lists if applicable hier massa doorslijpen RIGHT LEFT Tussen beide massa s een weerstand van 1R solderen Modificatie tegen brommen Massa...

Page 11: ...l 11 Measurement Set up GND GND Left Right MYTH 11 out1 out2 inp2 inp1 gnd THD Amplitude Frequency Oscillator THD out THD ANALYZER x y inp2 time div inp1 gnd SCOOP out1 out2 inp2 inp1 Scoop SWITCH BOX...

Page 12: ...h 11 Service Manual 12 General Overview Myth 11 Myth 11 protection M11 prot sch Myth 11 input M11 inp sch Myth 11 rectifier M11 rect sch Myth 11 amplifier left M11 ampl sch Myth 11 amplifier right M11...

Page 13: ...220n 250V C6 220n 250V C9 220n 250V C8 220n 250V C7 220n 250V C5 220u 63V D3 1N4007 D2 1N4007 2 1 2 1 2 1 2 1 FASE NUL 2 1 2 1 2 1 2 1 1 2 1 2 2 1 2 1 2 1 2 1 OUT1 OUT1 50V1 GND_BEV GNDOUT1 AC1_SEC1 A...

Page 14: ...R37L 100R R39L 0R22 5W R29L 68R R31L 0R22 5W R38L 68R R32L 47R 2W R40L 0R22 5W Q10L 2SC2705 C5L 10p Q11L 2SA1145 Q15L 2SJ200 Q18L 2SJ200 Q14L 2SK1529 Q17L 2SK1529 Q12L 2SC4382 Q13L 2SA1668 D6L 1N4007...

Page 15: ...2 5W R37R 100R R39R 0R22 5W R29R 68R R31R 0R22 5W R38R 68R R32R 47R 2W R40R 0R22 5W Q10R 2SC2705 C5R 10p Q11R 2SA1145 Q15R 2SJ200 Q18R 2SJ200 Q14R 2SK1529 Q17R 2SK1529 Q12R 2SC4382 Q13R 2SA1668 D6R 1N...

Page 16: ...SPHINX Myth 11 Service Manual 16 Input Output INPUT OPTO AMP_PHTRAN RSIG LSIG RGND LGND OPTO OPTO...

Page 17: ...100n R10 560R R13 560R DGND DGND DGND DGND DGND R12 2k2 R11 2k2 C14 100n Q1 BD879 D4 BYD77 led protect led stand_by power led LOW BIAS LOW BIAS DGND 50V D7 BYD17 D5 BYD17 C17 100n C18 100n C16 100n R...

Page 18: ...capacitor C15 330u 6V3 Electrolytic capacitor C16 100n MKT capacitor C17 100n MKT capacitor C18 100n MKT capacitor C19 1n MKT capacitor C19L 1n MKT capacitor C19R 1n MKT capacitor C1L 120p Styroflex...

Page 19: ...1PIN Electrolytic capacitor C3R 1u MKT capacitor C4 1u 16V Electrolytic capacitor C4 220n 250V MKT capacitor C40L 2200u 63V Electrolytic capacitor C40R 2200u 63V Electrolytic capacitor C41L 2200u 63V...

Page 20: ...9 220n 250V MKT capacitor C9L 100n MKT capacitor C9L 1PIN Connector C9R 100n MKT capacitor CN1 INPUT CINCH 2P D1 LED LED red D1 SB356 Diode D1L LED LED red D1R LED LED red D2 1N4007 Diode D2 LED LED r...

Page 21: ...sistor Q16L 2SC1775 Transistor Q16R 2SC1775 Transistor Q17L 2SK1529 Transistor Q17R 2SK1529 Transistor Q18L 2SJ200 Transistor Q18R 2SJ200 Transistor Q1L 2SK389 DUAL N JFET Q1R 2SK389 DUAL N JFET Q2L 2...

Page 22: ...istor R16L 56R Resistor R16R 56R Resistor R17 10k Resistor R17L 39R Resistor R17R 39R Resistor R18 390R Resistor R18L 3k3 Resistor R18R 3k3 Resistor R19 4k7 Resistor R19L 220R Resistor R19R 220R Resis...

Page 23: ...esistor R33L 10R 5W Resistor R33R 10R 5W Resistor R34L 10R 5W Resistor R34R 10R 5W Resistor R35L 220R Resistor R35R 220R Resistor R36L 100R Resistor R36R 100R Resistor R37L 100R Resistor R37R 100R Res...

Page 24: ...or Part Type Description R8 4k7 Resistor R8L 820R Resistor R8R 820R Resistor R9 10k Resistor R9L 22R Resistor R9R 22R Resistor REL1L SCHRA_4W Relay REL1R SCHRA_4W Relay S1 SWITCH SPST Switch S2 SWITCH...

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