Sphinx PhonoEqualizer SERVICE MANUAL

1.

SERVICE MANUAL

PHONO EQUALISER

SPHINX Phono equaliser Service Manual

1. UNPACKING.......................................................................................................................................3

2. CONTACTING THE MANUFACTURER.............................................................................................3

3. THE PHONO EQUALISER AT A GLANCE........................................................................................4

Front panel...................................................................................................................................................4

Rear panel ...................................................................................................................................................5

4. INSTALLATION AND CONNECTIONS..............................................................................................6

Installation....................................................................................................................................................6

Connecting the mains cable ........................................................................................................................6

Audio connections .......................................................................................................................................6

Connecting the pre-amp ..............................................................................................................................6

Connecting the turntable..............................................................................................................................6

Connecting the optical cables......................................................................................................................6

5. CHANGING THE SETTINGS..............................................................................................................7

Removing the cover.....................................................................................................................................7

a. LED: Project or Myth Series standard......................................................................................................7

b. Input sensitivity (Gain) .............................................................................................................................8

c. Input capacity (MM)..................................................................................................................................8

d. Cartridge type / Input impedance.............................................................................................................9

e. RIAA or 78 rpm........................................................................................................................................9

f. 78 rpm filter...............................................................................................................................................9

Replace the cover........................................................................................................................................9

6. OPERATION......................................................................................................................................10

Switching on...............................................................................................................................................10

Standby......................................................................................................................................................10

Switching off...............................................................................................................................................10

7. THE 78 RPM MODES .......................................................................................................................10

8. CARE AND MAINTENANCE.............................................................................................................11

9. TECHNICAL SPECIFICATIONS.......................................................................................................11

10. PROBLEMS AND SOLUTIONS......................................................................................................12

11. DIAGRAMS AND PARTS LIST.......................................................................................................13

Overview Components...............................................................................................................................14

General Overview Phono Equaliser...........................................................................................................15

Amplifier.....................................................................................................................................................16

Power Supply and Control.........................................................................................................................17

Parts List....................................................................................................................................................18

2

SPHINX Phono equaliser Service Manual

The Sphinx Phono equaliser design

This service manual will help you to optimally
service and repair the Sphinx Phono equaliser.

The Phono equaliser active MM and MC phono pre­preamplifier is the first to obtain the extremely high
audio quality standards of the Sphinx product line.
The design has therefor been only been finalised
after numerous intensive comparative listening
sessions. It is based on a radically new amplifier
design using special complementary FETs in a
single housing (the same that are used for the
Project Eight preamplifier). This is guarantees ultra­low noise and an incomparable transient response.
It offers numerous user adjustable settings for MM
and MC (Gain, Impedance, etc.). This enables you
to fine-tune the Phono equaliser to almost any
cartridge on the market.

It is however not confined to the regular MM and
MC cartridges but in addition offers special settings
for the use of 78-rpm records!
One of which is a specially designed filter: this
ensures the correct playback correction curve. And
thus prevents the usual annoying increased surface
noise of the records when played via ‘normal’
phono preamps. It restores the actual sound quality
of the records.

To obtain the maximum quality from this Phono
equaliser it is necessary to use it with top quality
audio components, preferably with other Sphinx
components.
The Phono equaliser may be used with
components from the Sphinx Project Series, the
Myth Series and even with non-Sphinx products.

1. UNPACKING

Before leaving the factory every Phono equaliser is
subjected to stringent and extensive technical and
exterior quality inspection.
This ensures you will enjoy many years of high
quality audio performance from a perfect-looking
product.

After unpacking your Phono equaliser we therefore
recommend you carefully check it for any transport
damage.
In case of damage: please contact your Sphinx
dealer immediately and retain all packing materials
for possible proof of damage and possible claims.

Even if the component is in perfect condition you
should still keep the packing materials. If you need
to transport your Phono equaliser 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:

Telephone [phone]
Fax [phone]
E-mail [e-mail]

It is always very helpful and efficient if you have all
relevant information about the specific product and
the problem ready.

3

SPHINX Phono equaliser Service Manual

3. THE PHONO EQUALISER AT A GLANCE

Front panel

1. LED:
in green

Standby red

(for Myth Series: not illuminated)

4

SPHINX Phono equaliser Service Manual

Rear panel

2. R IN: Connect to this input the right (red) output

cable from the turntable.

3. L IN: Connect to this input the left (white or

black) output cable from the turntable.

4. R OUT: Connect this output to the right input of

the (pre-) amplifier

5. L OUT: Connect this output to the left input of

the (pre-) amplifier.

6. GND: Connect here the separate ground wire

from the turntable.
Also connect here the ground wire from the
(pre) amplifier (if applicable).

7. Control IN: Connect here the optical cable from
another Sphinx component’s Control Out
(usually the preamplifier).

8. Control OUT: Connect here the optical cable
that goes to another Sphinx component’s
Control In.

9. AC IN: Connect the mains cable to a mains
power outlet (100 - 240 VAC).

10. Manufacturer’s label: (at housing underside)
This shows important data for the component,
such as serial number and mains power
voltage.

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SPHINX Phono equaliser Service Manual

4. INSTALLATION AND CONNECTIONS

Installation

The Phono equaliser will not become very hot, so
placement is not critical, although you should not
place it on top of or near other heat-radiating
equipment (such as power amps) or in direct
sunlight.
If you use it in a closed cabinet or on a bookshelf,
please ensure unrestricted ventilation around the
component.
To prevent any possible interference keep power
supply cables away from all audio cables.

Note: The mains power transformer of the Phono
equaliser is mounted at the front side.

Audio connections

Before you start connecting equipment it is always
wise to check whether all the mains power cables of
all components are disconnected from the mains
outlets! This will prevent any damage to the
loudspeakers and amplifiers caused by incorrect
wiring or settings.
Make sure you connect L and R properly. Most cinch
cables use Red for the Right channel and White or
Black for Left.
The cinch connectors on the rear panel of the Phono
equaliser have a red centre for the right channel and
a white one for the left channel.

Position the Phono equaliser as close to the
turntable as possible while keeping the cables as
short as possible.
Always connect the separate ground wire from the
turntable to the GND terminal (6).

If all these conditions are met, the Phono equaliser
will perform to the extremely high standards it is
designed for.

Connecting the mains cable

Before you connect the cable please check
whether the mains voltage indicated on the
manufacturer’s label on the rear panel is the
same as your local mains voltage.

If not: please contact your dealer and do not connect
the component to the mains.

The Phono equaliser does not have a dedicated
on/off switch. After you have connected it to the
mains power it will always be active while the default
setting is ON..
This way the electronic circuits will be kept at
optimum working temperature so you can enjoy
maximum audio quality immediately after switching
on. Additionally it significantly increases the life span
of the component.
Via the Control IN input (7) however it may be
remotely switched to Standby by another Sphinx
component.

When making the connections please refer to the
descriptions for parts 2. to 10. on page 5.

Connecting the pre-amp

Connect the R OUT (4) and L OUT (5) to the LINE­or AUX inputs of the pre-amp, using normal cinch
cable (but of top quality!).
Connect the separate ground wire (if supplied) from
the pre-amp to the GND terminal (6).

Connecting the turntable

Connect the (in most cases fixed) audio cable from
the turntable to the R IN (2) and L IN (3).
Connect the separate ground wire from the turntable
to the GND terminal.

Connecting the optical cables

Connect the CONTROL OUT of a Sphinx pre-amp to
the CONTROL IN (7) of the Phono equaliser. It will
then switch to Standby mode as soon as the pre­amp is set to Standby.
Connect the Phono equaliser’s CONTROL OUT (8)
to the CONTROL IN of another Sphinx component. It
will then automatically switch to Standby as soon as
the Phono equaliser is selected to Standby.

Ensure proper connection of the optical cables,
otherwise the Standby LED on the front panel may
remain off, even though the Standby mode is
activated.

Connect the mains cable after you have connected
all other components in the system, have double­checked all connections and after the Phono
equaliser has been matched to the cartridge in use
(see Chapter 5).

If the CONTROL IN is not used and the Phono
equaliser is placed in strong direct sunlight, the
Standby mode may self-activate.
In that case you should place the supplied dummy
connector in the CONTROL IN jack.

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SPHINX Phono equaliser Service Manual

5. CHANGING THE SETTINGS

The Phono equaliser may be used with a wide
range of cartridges, including the 78 rpm types.
Before you can use the Phono equaliser it should
therefore be matched to your specific cartridge and
application.

In addition there are two special filters that may be
selected.
Note: The ‘rumble’ filter (12 dB/octave@10 Hz) can
not be deselected.
And you can even select the working mode of the
LED on the front panel: Project Series or Myth
Series!

In order to select the correct settings you’ll need the
following data:

a. The type of audio system:

Sphinx Project or Myth Series

Re. the cartridge:
b. The output sensitivity
c. The output capacitance
d. The type: MM or MC and

the output impedance

And finally:
e. The type of records: normal or 78 rpm.

These data you may find in the manuals and/or
technical specifications of the equipment.
Write these (preferably with a pencil) into the last
column of the following table.
The Phono equaliser’s default values are marked in
the first column:

Setting Default Your data

a.
b.
c.
d.
e.

f.

LED:
Project Series
High Gain
(250-750 µV)

47 pF
MC cartridge

200 ohm
RIAA

78 rpm filter OFF

B. Some values are different

In that case you may have to change one or more
settings. You should use the following procedures
to ensure correct results.

You may refer to the sticker inside the cover
showing the settings for each DIP-switch.

Which setting should be changed is wholly
dependent on the default values that differ from
your data.
Note: If you have to change more values, the order
in which you adjust settings a – f is not important.

ATTENTION: Before starting the procedures
always first disconnect the mains cable from
the power outlet!

Removing the cover

Carefully (to prevent any scratching of the surface)
remove the small Phillips screws on the left-hand
side and on the right-hand side.
Remove the cover and store it in a safe place.
However, make sure that you are able to read the
sticker on the inside when necessary.

You’ll see the mains transformer and the circuit
board with the components and switches.

The Phono settings are changed by means of the
small switches in the four red ‘switch blocks’
(showing the text ON).
The LED setting is changed with the small shorting
plug (positioned closest to the 8-pin power supply
connector at the front of the housing).

a. LED: Project or Myth Series standard

When using the Phono equaliser with the Sphinx
Myth Series you are able to give the LED (1.) the
same functionality as that on the Myth Series (when
the equipment is ‘on’ the LED is ‘off’).

- Remove the red shorting plug.

- You will see two free pins.

- Replace the plug so it covers both pins.

- Ready!

This simplifies the procedure while showing exactly
the default value(s) differing from your data and
thus which setting(s) need to be changed!

A. Default values match your data and system

You do not have to change anything, may skip this
chapter, go straight to Chapter 6 and start using the
Phono equaliser.

If there are no other settings to be changed you
may continue with “Replace the cover”. Otherwise
select one of the following settings.

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SPHINX Phono Equaliser Service Manual

b. Input sensitivity (Gain)

It is important to match the input sensitivity of the
Phono equaliser to the output value of the cartridge
in use. Only this will ensure the maximum S/N ratio
and will prevent distortion.

The Gain has three settings:

- High: for cartridges with an output signal

between 250 µV and 750 µV.

- Mid: for cartridges with an output signal

between 750 µV and 1,5 mV.

- Low: for cartridges with an output signal

between 1,5 mV and 15 mV.
The Gain is set with switches 1 and 2 of the large

red ‘switch blocks’ (one for each channel).
Using the value of your cartridge (as marked in the

table), move the switches to the correct value
according to one of the following pictures.

c. Input capacity (MM)

This setting is specifically for MM cartridges. The
standard value is 47-pF, but some cartridges need
a value of 147-pF for optimum results.

Note: This setting has no influence on the MC
settings.

The standard value is ‘LOW’ (47-pF).

You select the HIGH value by moving switch 3 to
the upper (ON) position.

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SPHINX Phono Equaliser Service Manual

d. Cartridge type / Input impedance

For each cartridge type you need to set the correct
input impedance.
You may find the value for your cartridge in its
manual under the technical specifications.

The impedance is set with switches 4, 5 and 6.
If your MC cartridge needs an impedance other

then 200 ohm you may select:

- 100 ohm or

- 50 ohm.

For a MM cartridge however you can only select:

- 51 kohm.

e. RIAA or 78 rpm

The standard replay correction is RIAA, this is also
suitable for many 78 rpm records. The Phono
equaliser can be switched to a special 78 rpm
curve needed by certain records (see also
Chapter-7. “The 78 rpm modes”).
This is set with switches 1 and 2 on the small red
‘blocks’.
.

f. 78 rpm filter

To ensure proper 78 rpm replay quality with modern
audio systems, it is necessary to use a special low­pass filter. Otherwise the frequencies above 4 kHz
will become too emphasised. After selecting this
filter the replay quality will be more according to the
‘old’ standards.

Replace the cover

After you have changed the settings we advice you
to recheck whether each setting is correctly done. It
is also very useful to make a note of all the
changes you have made for future reference.
Then replace the cover and tighten the screws.
The Phono equaliser is now ready for use with your
audio system.

9

SPHINX Phono Equaliser Service Manual

6. OPERATION

After you have properly adjusted all settings you
may start using the Phono equaliser.

Connect the mains cable to a mains outlet
The LED (1) will blink red for some time after which
it changes to green (when the Myth setting is
selected it will go off).

Switching on

The Phono equaliser per default is always switched
on and can not be switched off.

This way the electronic circuits will be kept at
optimum working temperature so you can enjoy
maximum audio quality immediately after switching
on. Additionally it significantly increases the life
span of the component.

Standby

The Phono equaliser may be remotely switched to
Standby by another Sphinx component if it is
connected to the CONTROL IN (7) optical input.
The LED will switch to red.

7. THE 78 RPM MODES

When ‘cutting’ a record master for vinyl records the
audio signal is sent (for technical reasons) through
a special correction equaliser: this increases the
highs and decreases the lows. During replay of the
record this correction curve is ‘reversed’ by the
replay filter in a phono pre-amp.
The RIAA curve is an international standard curve
for 33 and 45 rpm records. This attenuates the
frequencies above 2120 Hz and amplifies those
below 500 Hz (these points are also known as the
‘corner frequencies’ or fc).
For 78 rpm records there have been a number of –
incompatible – standards. Research by the Sphinx’
designers showed however that the most
commonly used standards were the RCA (2120
and 500 Hz) and AES (2500 and 500 Hz). These
actually use the same curve as the RIAA, so most
78 rpm records can properly be played with the
normal phono input.
An important (and differing) group was formed by
EMI, Decca and Columbia with fc-‘s of 250, 200 and
300 Hz respectively.
That is why the Phono equaliser offers the special
78RPM mode of 250 Hz (as described in 5e). So
you may also play all these specific 78 rpm records
properly.

Switching off

The only way to switch the Phono equaliser off
completely is to unplug the mains cable.

In the 78rpm era quality of the audio systems was
much worse than today, especially lacking
response above 4000 Hz. Due to this ‘natural low­pass filter’, record surface noise, etc. was
undetectable.
When you replay these records via a modern audio
system however, you will hear an annoying amount
of surface noise and maybe even a ‘thin’ or
‘scratchy’ sound quality.
That is why the Phono equaliser offers the 78RPM
FILTER mode (as described in 5f). This special
filter is designed with the help of many listening
tests. It ensures a usable high frequency replay
quality with modern audio systems.

Note: A special problem are recordings using the
following different standards: ‘old’ RCA, EMI or
Decca. These did not incorporate any HF record
correction!
Playback via a normal system will thus result in
extremely attenuated highs. This is inherent to
these recordings and not caused by the modern
replay systems!

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SPHINX Phono Equaliser Service Manual

8. CARE AND MAINTENANCE

Clean the exterior with a soft, lint-free, anti-static
cloth. Do not use force while wiping the surface.
To remove difficult stains use a few drops of
detergent on a moist cloth, sweep carefully and
wipe dry afterwards.

Do not use polishing or cleaning agents: they
may damage the sensitive acrylic finish.

Do not use aerosol cleaning agents.
Most contain solvents, which might react with and
damage the acrylic finish.

If some scratching occurs, please consult your
Sphinx dealer first. He can give you advice about
possible solutions.

9. TECHNICAL SPECIFICATIONS

Bandwidth 0 – 111,000 Hz (+0/-3 dB)
Phase response error <1°
Gain High: 66 dB max. (2000x)

THD+N (IHF-A) <0.02% (2nd harm., 10 – 20,000 Hz)
IMD <0.6%
S/N ratio (IHF-A) >80 dB (>90 dB)
Channel separation >95 dB
Slew Rate

Inputs 2x cinch (WBT gold plated)
Level, nominal (for 1 V output) 0.13 V (-18 dBV)
Impedance 51 kohm

Capacity

Mid: 58 dB max. (800x)
Low: 37 dB max. (70x)

> 24 V/µs

200 ohm
100 ohm
50 ohm (selectable)
MM: 47 pF or 147 pF (selectable)

Outputs 2x cinch (WBT gold plated)
Level 1.1 V nominal

Impedance <10 ohm
Rumble filter 12 dB/octave @ 10 Hz
Sphinx Control 1x optical IN, 1x optical OUT
Power supply Internally, fully stabilised

Supply capacitance 16,280 µF total
Power transformer O-core
Power consumption 10 W (7 W standby)

Housing 1,5 mm steel, with powder coating
Dimensions (h x b x d) 70 x 120 x 340 mm

Weight 3.5 kg

Measurements done while using the following settings: (@1 kHz, MC input, Gain High, Ri 100 ohm)

9.2 V max. (19.3 dBV) (1 – 100,000 Hz, THD <0.02%)

Chassis acoustically decoupled

This unit conforms to the EMC interference regulations issued by the EU and to the CE standards.
This unit complies with safety regulation VDE 0860 and therefore with international safety regulation IEC 65.

Technical specifications may be changed by SPHINX without prior notice if technical developments make this
necessary.

©1999 Audioscript BV

11

SPHINX Phono Equaliser Service Manual

10. PROBLEMS AND SOLUTIONS

At the moment of writing the Phono equaliser has
no known specific problems.
If in the future you encounter any problem(s) you
may enter the info in this table. This table can then
be used for future reference.

Problem Cause Solution Refer to

Please 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.

page…

12

SPHINX Phono Equaliser Service Manual

11. DIAGRAMS AND PARTS LIST

The next pages contain a complete set of
schematic drawings including the associated parts
list (if applicable).

13

SPHINX Phono Equaliser Service Manual

Overview Components

Audio section

Control section

jumper for Project/Myth selection

FUSE 0.5AT

230V ~

230V ~NCBrownNCBlack

Purple

Power supply section

From transformer

Yellow

14

SPHINX Phono Equaliser Service Manual

General Overview Phono Equaliser

powersupplyphono-ps.sch

+15V

+15V

+15V

-15V

-15V

+15V

-15V

-15V

pre-amplifierphono-a.sch

15

SPHINX Phono Equaliser Service Manual

Amplifier

10uF/35V

10uF/35V

+15V

100n

+

R38L
910R

Q5L
A970

LED

100n

D2L

C32L

Q6L
C2240

R39L
910R

R38R
910R

Q5R
A970

LED

100n

D2R

C32R

Q6R
C2240

R39R
910R

+

C17L

C19L

C21L

GND

GND

GND

GND

+

C20L

10uF/35V

10uF/35V

+

C19R

+

C20R

10uF/35V

+15V +15V

-15V

-15V

REL1C
RELAIS DPDT

AGND

+

C22L

C15L

-15V

10uF/35V

AGND

100p

CN2

AGND

C15R

AGND

10uF/35V

+15V

100p

+

C21R

REL1B
RELAIS DPDT

AGND

+

C22R

-15V

10uF/35V

Q7L
C4382

R40L
10R

R24L
49R9

R41L
10R

Q8L
A1668

100n
C18L

100n
C17R

Q7R
C4382

R40R
10R

R24R
49R9

R41R
10R

Q8R
A1668

100n
C18R

CN1

AGND

gain low gain mid gain high

off
off offonon

L2M

Input filter (100pF)

L3M

on

Ri=50R Ri=100R

L4M

don't careondon't care

L5M

don't care

L6M

on off off

R8L

R9L

Q1L
K146

R11L
220R

Q1R
K146

R11R
220R

R10L
82R

Q4L
C2240

LED
D1L

R10R
82R

Q4R
C2240

LED
D1R

78RPM

off

78RPM LF (250Hz)

off

off
on

R13L

2k7

100k

U1L
LT1115

C8L
3pF

U1R
LT1115

68uF/35V

68uF/35V

68uF/35V

68uF/35V

+

+

GND

+

+

GND

1M

C10L

C9L

R15R'1MR15R

C10R

C9R

R15L1MR15L'

R18L
330R

R19L
33R

C8R
3pF

1M

R18R
330R

R19R
33R

Q2L
C2240

R14L
33k

GND

R12L
10k

100n
C6L

R9R

R13R

2k7

100k

Q2R
C2240

R14R
33k

GND

R12R
10k

100n
C6R

off

C12L
330p

R17L1
43k

C11L

SL1

1n5

R20L
47R

L2M L1M

C12R
330p

R17R
43k

C11R

SR1

1n5

R20R
47R

R2M R1M

C14L
1n5

C13L
4n7

R16L
680k

C13'L
15n

R21L
10k

R21L
910R

GND

C14R
1n5

C13R
4n7

R16R
680k

C13'R
15n

R21R
10k

R21R
910R

GND

1n

1n

C37L

C36L

R34L

U2LB

39k

LT1113
R33L
39k

SL2

1n
C36R

R33R
39k

SR2

1n
C38L

GND

SL3

R31L
10k

SL4

1u

1n
C37R

R34R
39k

1n
C38R

GND

SR3

R31R
10k

C34R

SR4

1u

2k7

R7L

100p
C3L

R2L
470k

GND

100p
C3R

R2R
470k

GND

don't careL1M

Ri=200R Ri=50k

on
off

27R

R3L
49R9

L6M

R4L
49R9

L5M

R5L
100R

L4M

R6L
51k

L3M

GND GND

R7R
27R

R3R
49R9

R6M

R4R
49R9

R5M

R5R
100R

R4M

R6R
51k

R3M

GND GND

off
off
off

100p
C1L

GND

100p
C1R

GND

C5L

6n8

Q3L
C2240

33p
C7L

68p
C4L

R8R
2k7

C5R

6n8

Q3R
C2240

33p
C7R

68p
C4R

RIAA HF (43k//1n88)

SL1

on

RIAA LF (43k//6n2)

SL2

on

78RPM filter on 78RPM filter off not allowed

SL3

on

SL4

off off

100n

R35L
2k7

C31L

R36L
10k

C33L
33p

C35L1uC34L

U2LA

LT1113
R32L
20k

R37L

100n

GND

2k7

C30L

100n

R35R
2k7

C31R

R36R

10k
U2RB
LT1113

C33R
33p

C35R

U2RA
LT1113

1u

R32R
20k

R37R

100n

GND

2k7

C30R

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SPHINX Phono Equaliser Service Manual

Power Supply and Control

10CN7J

Drawn by : J.H.Risselada

D323

LED

R304
330R

D321

Q301
A970

R302
10K

10U/35V

+

C30

D19
LED

10U/35V

+

C29

100nC4100n
C7

REL1A
MT2-24V

+

C351

68U/6V3

R7
330R

Q3
A970

R8
10K

+

C34

68U/6V3

AC

BYD17
D10

R15
33K

R14
100K

R25

9CN7I

1R00

100n
C19

100n
C20

R26
1R00

R27

7CN7G

1R00

100n
C23

100n
C24

R28

8CN7H

1R00

TR1

OPTIND1OPTOUT

100n
C8

BYD17D3BYD17
D5
BYD17D2BYD17
D4

BYD17D7BYD17
D9
BYD17D6BYD17
D8

+5V

R20
3K9

R11
100k

100n
C22

4700U/25V

100n

+

C15

C21

100n
C26

4700U/25V

100n

+

C17

C25

R21
330R

R12
33k

Q2
BCV47

100n
C3

BYD17
D11

DGND

1N4148

1N4148
D325

Q307
C4382

Q305
A1668

D18

Q5
C4382

Q6
A1668

R315 1K00

R24 1K00

VCC
GND

C5

C6

6

1N4148
D17

6

3

GP4
GP52GP1

1
8

R16
330R

100n

DGND

100n

R17
330R

Q303

R312

R308

C2240

10R0

33K

R307

R311

10K

10R0

1N4148

Q4

R22

R9

C2240

10R0

33K

R10

R23

10K

10R0

+5V

R13
100k

U$4 12C5XX

7

GP0

GP0

6

GP1

5

GP2

4

GP3

MCLR

1CN6A

2CN6B

3CN6C

R319
10K

100n

74

C353

3

2

U305
OP77

100n

74

C33

3

2

U2
OP77

100n

+

10U/35V

C1

C2

R321
1K00

100n

+

R318
3K48

R29
10K

R30
3K48

+5V

+

C357

C355

330U/6V3

330U/6V3

R31
1K00

100n

+

+

C35

C37

330U/6V3

330U/6V3

4CN7D
3CN7C
2CN7B
1CN7A

+15V

R323
5K6

LED

D329

+

C361

C31

LED

D328

10U/35V

AGND

R32
5K6

N

LED

D21

+

C36

C32

LED

D20

10U/35V

-15V

R1

5CN7E

1R00

R2

6CN7F

1R00

L

AC

100n

BYD17

C14

D14
BYD17

100n

D16

C11

MCLR

+5V

DGND

GP0
GP1

100n

BYD17

C13

D13
BYD17

100n

D15

C12

CN?

1
2
3
4
5

PROG CON

PR1 PR1'
PR2
PR3
PR4 PR4'

4700U/25V

+

C18

10U/35V

+

C16

U1 7805

Vout Vin

100n
C28

+5V

GND

100n
C27

DGND

17

SPHINX Phono Equaliser Service Manual

Parts List

Designator Part Type Description

C1 100n MKT capacitor
C10L 68uF/35V Electrolytic capacitor
C10R 68uF/35V Electrolytic capacitor
C11 100n MKT capacitor
C11L 1n5 MKT capacitor
C11R 1n5 MKT capacitor
C12 100n MKT capacitor
C12L 330p MKT capacitor
C12R 330p MKT capacitor
C13 100n MKT capacitor
C13L 4n7 MKT capacitor
C13'L 15n MKT capacitor
C13R 4n7 MKT capacitor
C13'R 15n MKT capacitor
C14 100n MKT capacitor
C14L 1n5 MKT capacitor
C14R 1n5 MKT capacitor
C15 4700U/25V Electrolytic capacitor
C15L 100p MKT capacitor
C15R 100p MKT capacitor
C16 10U/35V Electrolytic capacitor
C17 4700U/25V Electrolytic capacitor
C17L 100n MKT capacitor
C17R 100n MKT capacitor
C18 4700U/25V Electrolytic capacitor
C18L 100n MKT capacitor
C18R 100n MKT capacitor
C19 100n 100n MKT
C19L 10uF/35V Electrolytic capacitor
C19R 10uF/35V Electrolytic capacitor
C1L 100p MKT capacitor
C1R 100p MKT capacitor
C2 10U/35V Electrolytic capacitor
C20 100n MKT capacitor
C20L 10uF/35V Electrolytic capacitor
C20R 10uF/35V Electrolytic capacitor
C21 100n MKT capacitor
C21L 10uF/35V Electrolytic capacitor
C21R 10uF/35V Electrolytic capacitor
C22 100n MKT capacitor
C22L 10uF/35V Electrolytic capacitor
C22R 10uF/35V Electrolytic capacitor
C23 100n MKT capacitor
C24 100n MKT capacitor
C25 100n MKT capacitor
C26 100n MKT capacitor

18

SPHINX Phono Equaliser Service Manual

Designator Part Type Description

C27 100n MKT capacitor
C28 100n MKT capacitor
C29 10U/35V Electrolytic capacitor
C3 100n MKT capacitor
C30 10U/35V Electrolytic capacitor
C30L 100n MKT capacitor
C30R 100n MKT capacitor
C31 10U/35V Electrolytic capacitor
C31L 100n MKT capacitor
C31R 100n MKT capacitor
C32 10U/35V Electrolytic capacitor
C32L 100n MKT capacitor
C32R 100n MKT capacitor
C33 100n MKT capacitor
C33L 33p MKT capacitor
C33R 33p MKT capacitor
C34 68U/6V3 Electrolytic capacitor
C34L 1u MKT capacitor
C34R 1u MKT capacitor
C35 330U/6V3 Electrolytic capacitor
C351 68U/6V3 Electrolytic capacitor
C353 100n MKT capacitor
C355 100n MKT capacitor
C357 330U/6V3 Electrolytic capacitor
C35L 1u MKT capacitor
C35R 1u MKT capacitor
C36 330U/6V3 Electrolytic capacitor
C361 330U/6V3 Electrolytic capacitor
C36L 1n MKT capacitor
C36R 1n MKT capacitor
C37 100n MKT capacitor
C37L 1n MKT capacitor
C37R 1n MKT capacitor
C38L 1n MKT capacitor
C38R 1n MKT capacitor
C3L 100p MKT capacitor
C3R 100p MKT capacitor
C4 100n MKT capacitor
C4L 68p MKT capacitor
C4R 68p MKT capacitor
C5 100n MKT capacitor
C5L 6n8 MKT capacitor
C5R 6n8 MKT capacitor
C6 100n MKT capacitor
C6L 100n MKT capacitor
C6R 100n MKT capacitor
C7 100n MKT capacitor
C7L 33p MKT capacitor
C7R 33p MKT capacitor
C8 100n MKT capacitor

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SPHINX Phono Equaliser Service Manual

Designator Part Type Description

C8L 3pF MKT capacitor
C8R 3pF MKT capacitor
C9L 68uF/35V Electrolytic capacitor
C9R 68uF/35V Electrolytic capacitor

CN? PROG CON Connector
CN6 3PIN-M Connector
CN7 10PIN-M Connector

D1 OPTOUT Optical output
D10 BYD17 Diode
D11 BYD17 Diode
D13 BYD17 Diode
D14 BYD17 Diode
D15 BYD17 Diode
D16 BYD17 Diode
D17 1N4148 Diode
D18 1N4148 Diode
D19 LED LED red
D1L LED LED red
D1R LED LED red
D2 BYD17 Diode
D20 LED LED red
D21 LED LED red
D2L LED LED red
D2R LED LED red
D3 BYD17 Diode
D321 LED LED red
D323 1N4148 Diode
D325 1N4148 Diode
D328 LED LED red
D329 LED LED red
D4 BYD17 Diode
D5 BYD17 Diode
D6 BYD17 Diode
D7 BYD17 Diode
D8 BYD17 Diode
D9 BYD17 Diode

Q1L K146 or K240 DUAL N-JFET
Q1R K146 or K240 DUAL N-JFET
Q2 BCV47 Transistor
Q2L C2240 Transistor
Q2R C2240 Transistor
Q3 A970 Transistor
Q301 A970 Transistor
Q303 C2240 Transistor
Q305 A1668 Transistor
Q307 C4382 Transistor
Q3L C2240 Transistor

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SPHINX Phono Equaliser Service Manual

Designator Part Type Description

Q3R C2240 Transistor
Q4 C2240 Transistor
Q4L C2240 Transistor
Q4R C2240 Transistor
Q5 C4382 Transistor
Q5L A970 Transistor
Q5R A970 Transistor
Q6 A1668 Transistor
Q6L C2240 Transistor
Q6R C2240 Transistor
Q7L C4382 Transistor
Q7R C4382 Transistor
Q8L A1668 Transistor
Q8R A1668 Transistor

R1 1R00 Resistor
R10 10K Resistor
R10L 82R Resistor
R10R 82R Resistor
R11 100k Resistor
R11L 220R Resistor
R11R 220R Resistor
R12 33k Resistor
R12L 10k Resistor
R12R 10k Resistor
R13 100k Resistor
R13L 100k Resistor
R13R 100k Resistor
R14 100K Resistor
R14L 33k Resistor
R14R 33k Resistor
R15 33K Resistor
R15L 1M Resistor
R15L' 1M Resistor
R15R 1M Resistor
R15R' 1M Resistor
R16 330R Resistor
R16L 680k Resistor
R16R 680k Resistor
R17 330R Resistor
R17L1 43k Resistor
R17R 43k Resistor
R18L 330R Resistor
R18R 330R Resistor
R19L 33R Resistor
R19R 33R Resistor
R2 1R00 Resistor
R20 3K9 Resistor
R20L 47R Resistor
R20R 47R Resistor

21

SPHINX Phono Equaliser Service Manual

Designator Part Type Description

R21 330R Resistor
R21L 10k Resistor
R21L 910R Resistor
R21R 10k Resistor
R21R 910R Resistor
R22 10R0 Resistor
R23 10R0 Resistor
R24 1K00 Resistor
R24L 49R9 Resistor
R24R 49R9 Resistor
R25 1R00 Resistor
R26 1R00 Resistor
R27 1R00 Resistor
R28 1R00 Resistor
R29 10K Resistor
R2L 470k Resistor
R2R 470k Resistor
R30 3K48 Resistor
R302 10K Resistor
R304 330R Resistor
R307 10K Resistor
R308 33K Resistor
R31 1K00 Resistor
R311 10R0 Resistor
R312 10R0 Resistor
R315 1K00 Resistor
R318 3K48 Resistor
R319 10K Resistor
R31L 10k Resistor
R31R 10k Resistor
R32 5K6 Resistor
R321 1K00 Resistor
R323 5K6 Resistor
R32L 20k Resistor
R32R 20k Resistor
R33L 39k Resistor
R33R 39k Resistor
R34L 39k Resistor
R34R 39k Resistor
R35L 2k7 Resistor
R35R 2k7 Resistor
R36L 10k Resistor
R36R 10k Resistor
R37L 2k7 Resistor
R37R 2k7 Resistor
R38L 910R Resistor
R38R 910R Resistor
R39L 910R Resistor
R39R 910R Resistor
R3L 49R9 Resistor

22

SPHINX Phono Equaliser Service Manual

Designator Part Type Description

R3R 49R9 Resistor
R40L 10R Resistor
R40R 10R Resistor
R41L 10R Resistor
R41R 10R Resistor
R4L 49R9 Resistor
R4R 49R9 Resistor
R5L 100R Resistor
R5R 100R Resistor
R6L 51k Resistor
R6R 51k Resistor
R7 330R Resistor
R7L 27R Resistor
R7R 27R Resistor
R8 10K Resistor
R8L 2k7 Resistor
R8R 2k7 Resistor
R9 33K Resistor
R9L 2k7 Resistor
R9R 2k7 Resistor

REL1 MT2-24V Relay

TR1 OPTIN Optical output

U$4 12C5XX Microprocessor
U1 LM7805 Voltage regulator
U1L LT1115 Opamp
U1R LT1115 Opamp
U2 OP77 Opamp
U2L LT1113 Opamp
U2R LT1113 Opamp
U305 OP77 Opamp

©1999 Audioscript BV
Version: 1999-05-08

23