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MAS Marquis, Manual

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MAS Marquis Manual Download Page 11

K O S T A S

M E T A X A S   D E S I G N

D e s i g n   P h i l o s o p h y

09

This is the STATIC performance of a voltage regulator which although 
important, does not affect the overall sound of the amplifier as much
as the regulator's DYNAMIC performance which is influenced by the
speed and 'open loop gain' of the regulator.
To understand why the Dynamic performance of a voltage regulator is so
important, we need to go back to our basic amplifier circuit and investi-
gate what happens to the 1.0 Hz, 10 Volt output signal as it goes across
resistor R and encounters our voltage regulator.
To ensure an absolutely stable D.C. at V+ the residual of the 10 Volt
sine wave at the OUTPUT is fed through the negative feedback loop of
the regulator to force the amplifier to correct this error by applying an
inverted signal identical to the residual sine wave to totally eliminate
the residual sine wave at V+. A high speed regulator would therefore
treat a signal 1.0 Mega Hertz in the same manner as a signal at 1.0kHz.
The ultimate voltage regulator would effectively have a theoretical
output impedance (or 'Damping Factor') at V+ of zero ohms at all fre-
quencies as a result of its wide bandwidth before the addition of nega-
tive feedback.
In this way, the attenuation of the 10 Volts across the resistor R resid-
ual would be complete, and no attenuated component of the 10 VOLT
sine wave could be deflected and return to the OUTPUT of the circuit
and cause severe phase anomalies by adding to the new signal p;resent-
ed at the output - remember that it would take a few nanoseconds for
the signal to go through the resistor and come back.
This extraneous out-of-phase information if allowed to adds to the new 
OUTPUT signal, would then destroys TIME/PHASE characteristics of the
amplifier circuit. 
In real world power supply circuits, the impedance of the power supply 
actually increases with frequency because the open loop gain rolls off
at high frequencies .

45

R42

R38

R36

1

2

3

C9

R41

1

2

3

Q34

C10

56

4

R128

R127

R126

Q18

Q22

Q19

Q25

Q27

Q26

Q24

Q31

Q32

Q28

Q23

Q17

Q29

1

2

3

1

2

3

Q30

2

1

3

Q200A

7

8

6

Q200B

R102

R103

R101

R108

R116

R115

R125

R124

R123

R117

R119

R118

R122

R105

R100

R109

R107

R106

R121

R120

R104

R112

R111

R113

R110

R114

CE9

CE10

DZ1

L

Marquis Voltage Regulator

Summary of Contents for Marquis

Page 1: ...K O S T A S M E T A X A S D E S I G N Marquis K O S T A S M E T A X A S D E S I G N ...

Page 2: ... a d e s o f H i E n d 0 2 L i s t e n i n g R e f e r e n c e 0 5 D e s i g n P h i l o s o p h y 0 6 O p e r a t i n g I n s t r u c t i o n s 1 1 W h a t t h e c r i t i c s s a y 1 2 S p e c i f i c a t i o n s 1 4 C o n t r o l s F e a t u r e s 1 5 M a i n t e n a n c e 1 6 S c h e m a t i c 1 8 E C C o n f o r m i t y 1 9 ...

Page 3: ...wer supply First DAC to use lowest jitter APOGEE CLOCK First FULL range and high efficiency electrostatic First Audio Manufacturer to use BMW Porsche CAD PCB software design systems Yo u a r e a b o u t t o l i s t e n t o a n a m p l i f i e r w h i c h h a s e v o l v e d f r o m o v e r 2 0 y e a r s o f d e d i c a t e d l i s t e n i n g a n d t h e a p p l i c a t i o n o f t h e s t a t e o...

Page 4: ...K O S T A S M E T A X A S D E S I G N 3 Decades of Hi End 1980 s 02 Opulence Preamplifier Assembly Engraving Kostas Metaxas circa 1985 Soliloquy Monoblocks Ecstatic Revelation Electrostatics ...

Page 5: ...Speaker Reference System circa 1992 Assembly Assembly CZAR 2 way full range electrostatic Opulence Marquis Charisma Preamplifiers Stainless Steel Turret Punching Iraklis on test Empress Full range electrostatics using plastic composite moulded frame PCB design EMPEROR Assembly ...

Page 6: ... by component basis in 3D The Protel PCB software www protel com extends the quite normal listening tests on a component by component level to the PCB level Schematic Based simulations can test or verify the PCB s signal integrity by running the Signal Integrity Simulator which displays a Reflection and Crosstalk Analysis And the 3D visualization allows one to include the PCB as part of the overal...

Page 7: ...kest link in the playback chain K o s t a s M e t a x a s products have been conceived using extensive listening tests with a variety of state of the art ancillary equipment for more than 25 years Our amplifiers have been designed using a variety of state of the art phono playback equipment and our ABSOLUTE REFERENCE a custom made battery powered Stellavox SM 8 Tape Recorder using 1 4 tape at 30 i...

Page 8: ... POWER SUPPLIES Every power amplifier uses a large high current power transformer which feeds a high current bridge rectifier to convert the AC from the transformer into DC voltages which are then mains ripple filtered using massive comput er grade capacitors The rectifier bridge that is normally used is relatively large handles high current and low voltage which slow switching speed because of it...

Page 9: ...ve as it goes through R and returns back to the OUTPUT of the TRANSISTOR circuit and VALVE circuit In the VALVE circuit when 10 VOLTS travels across the 50 000 Ohms R towards the power supply impedance of 2 Ohms the 10V signal is attenuated 50 000 2 25 000 times Therefore 10V 25 000 0 0004 Volts of 1 0kHz sine wave On its way back to the OUTPUT of the circuit it is attenuated by the impedance of t...

Page 10: ...like the output impedance or Damping Factor of a power amplifier is less than one ohm at D C If we use a 2 0 Volt zener diode as our fixed DC voltage reference at the input of the D C amplifier which has a gain of 10 the resulting output voltage is 20 Volts D C The negative feedback loop of the amplifier which fixes the gain of 10 times the 2 0 Volt zener reference is very important because it mai...

Page 11: ...would effectively have a theoretical output impedance or Damping Factor at V of zero ohms at all fre quencies as a result of its wide bandwidth before the addition of nega tive feedback In this way the attenuation of the 10 Volts across the resistor R resid ual would be complete and no attenuated component of the 10 VOLT sine wave could be deflected and return to the OUTPUT of the circuit and caus...

Page 12: ...astest amplifier circuit and add a slow I C voltage regulator with an output capacitor and call it a finished design Our discrete voltage regulators are designed to have the absolute lowest noise reject mains ripple but more importantly to have a speed 1000 V microsecond which is a result of their wide bandwidth design an open loop frequency response greater than 500kHz and output imped ance which...

Page 13: ... The output stage of the preamplifier is connected to a DC protection circuit which activates a relay if it senses any DC before it can cause any damage to your speakers Mains Fuse A 2AMP SLOW BLOW DA205 Type fuse is located on the AC MAINS SOCKET If this blows simply replace with the same rating fuse If the fuse continues to blow please refer to the Maintenance Section of this manual for further ...

Page 14: ...self on the signal handling its chores with near invisibility K e n K e s s l e r H I F I N E W S R E C O R D R E V I E W E n g l a n d The Marquis constitutes in our opinion pure gold and is already the reference point in this price category and will not be superceded in a hurry Jean Hiraga Patrick Vercher LA NOUVELLE REVUE DU SON France The conclusion the sensation is perfect An Amplifier for 90...

Page 15: ...ade body and attack not slowing at all The mids are very descriptive with very good detail and purity soft and extremely sweet The highs are delicate with excellent body and special plasticity The stereo image has excellent dimensions and very good black character and by saying this I mean the black space that separates the instruments and makes them sound as separate entities with lifelike positi...

Page 16: ...capacitance of long greater than 2 metres interconnection cables 2 POWER SUPPLY An external supply houses the completely dual mono high current 46 000uF of primary filtering and stacked 100 Watt toroidal trans formers The DC supply is connected via a 5 pin umbilical cord socket arrangement to the mainframe where the D C encounters another 10 000uF of filtering before it reaches the regulation circ...

Page 17: ...K O S T A S M E T A X A S D E S I G N Contr ols Featur es 15 ...

Page 18: ... is in the UP position and VOLUME control is at position 9 5 Measure the voltage drop after the regulators the emitter of Q16 30 which should be 20 volts 6 If voltages are O K check the waveform on the oscilloscope it should show crossover distortion 7 Clip a multimeter across any of the 100OHMS output stage emitter resistors R46 56 55 45 and turn the trimpot anticlockwise until you measure approx...

Page 19: ...K O S T A S M E T A X A S D E S I G N Maintenance 17 ...

Page 20: ...R55a R56a KOSTAS METAXAS MARQUIS PRE AMPLIFIER CE1 CE2 CE3 CE4 CE5 CE6 CE7 CE8 DE5 DE6 DE7 DE8 DE9 DE10 DE11 DE12 R75a R75 R74a R74 C13 C13a CP1 CP2 CP3 CP4 R66 R67 R65 R37 DL2 DL1 DL4 DL3 1 2 3 4 5 6 JP1 VOL_R VOL_L 30V Q12 Q12a Q13a Q13 1 2 3 Q14 1 2 3 Q14a 1 2 3 Q15a 1 2 3 Q15 Q9a Q9 Q11 Q11a Q5 Q6 Q5a Q6a Q7a Q8a Q7 Q8 Q1 4 6 5 3 1 2 RA1 Q18a Q22a Q19a Q25a Q27a Q26a Q24a Q31a Q32a Q28a Q23a Q...

Page 21: ...ested to EN55020 Electromagnetic immunity of broadcast receivers and associated equipment In accordance with CISPR 16 1 Radio disturbance and immunity measuring apparatus CISPR 16 2 Methods of measurement of disturbances and immunity IEC 801 2 IEC 801 3 3V m 20dB IEC 801 4 1KV AC lines M a n u f a c t u r e r Metaxas Audio Systems 1460 Woodend Rd Romsey 3434 Victoria AUSTRALIA www metaxas com meta...

Page 22: ...K O S T A S M E T A X A S D E S I G N Design Philosophy 20 ...

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