Mark Levinson no 23 schematic

=============================================================================================

white

XLR-Cannon
connector fem.
bal input

+

2

-

3

1

o

=== ===

shorting
strap

black

green

10n KP

Camac
fem

=============

P1

Chassis

470n MKS

on board

0 Ohm

100p KP

100

to Mainboard Poweramp

white, non invert.

100p KP

Mark Levinson No 23
inputconnector-unit
allocated on
inputconnector-board

black

to Mainboard Poweramp

green

to Mainboard Poweramp
but n.c. there

blue

U1 U1

U1

U1

U1 U1U1U1

1N4003

1K

1N4003

100p KP

U5

U1U1

1K

470n MKS

1N4003

10K

1K

100

10K

10K

2N5401

2N5551

100p KP

20K

blue, invert.

to Mainboard Poweramp

black

Heatsink I

Heatsink II

+86V

100n ker

16K2

red

yellow

to Relay-driver

1N4003

Mark Levinson No 23
DC-Protection and
thermoprotect.-unit,
allocated on input
connector board

SPK2

2-8

27K

+

470/10

ROE

10K

1N4003

~

~

+84V

+

330/100

blue

8n2
KP

MKP

330nF

10K

4K89

10K

10K

1N4936

MJE15030

2R2

Rx1

3K16

10

2N3439

84V6

17K4

365

2N5401

10

10

17K4

red

red

2V2

470

ker

85V2

45V5

1900/150

+

3K01

10

2N5551

2N5551

44V9

29K4

2V8

10

22uF

MKP

330nF

8n2

KP

+117V

150/150

40K2

1K

+

45V5

+

1N5261B 47V

1 Watt

U3 U3

+

330/100

-84V

U3U3U3

MKP

330nF

8n2

KP

4K89

10K

2R2

Rx2
5K9

2N5416

10

MJE15031

1N4936

17K4

17K4

10

10

2N5551

365

470

ker

black

black

~

2N5401

2N5401

10

3K01

1900/150

+

~

29K4

22uF

10 1K

8n2
KP

MKP

330nF

+

1N5261B 47V

1 Watt

40K2

150/150

+

-117V

Mark Levinson No 23
voltageregulator-unit
for voltageamp

Mark Levinson No 23
peak current reducer
by "switch on"
allocated on front-board

transformer

10mF/6V3

+

10mF/6V3

68

68

2R2

BUSS
MDL 10
32V

+

BUSS
MDL 10

230

32V

VAC

transformer

RIFA
PME 271Y

10

10

4n7

10

RLY1

10mF/6V3

+

10mF/6V3

68

68

+

2R2

white

230VAC

15A 15A

black

black

47n/600V

black

1K

P38

1K27

TIP127

8n2

KP

4,1mA

<

1K

10

1N4936

MKP10

680n

680/100

+

KP5
8n2

+86V

Mark Levinson No 23
buffer-unit(currentamp)
dynamic bias-control

v

4,06mA

input

from pre­driver
output

10

200

10n

150

150

40R3

10K

20

1N4936

1N4936

10

white

U3

MJE15030

158

MJE15031

2SC2236

10

2SC2236

10

1

je 10-12mV

40R2

680n 10n

MKP10

je 10-12mV

red

yellow

2SC2236

1

10

.22

U1

U2

.22

IRF 0,5

35MB40A

~ ~

red

10

.22

NFB

.22

36mF/100V

+

red

6x MJ15024

10

.22

.1

10

.22

v

274mA

.22

22 degrees C above
ambient on Heatsink

.1

286mA

v

.22

.22

.22

1010

.22

1N4936

1N4936

.22

oker

(black)

200W8R

SPK1

2-8

700W2R

oker

(red)

10

10n

10n

10K

40K2

from pre­driver
output

input

8n2
KP

TIP122

1K27

20

40R3

<

4,1mA

U4

blue

10

1N4936

1N4936

1N4936

10

1K

10

2SA1006

680n

MKP10

1

10

2SA1006

680/100

+

KP

8n2

10

1

2SA1006

~ ~

black

Heatsink II

Heatsink I

U5

10

black

IRF 0,5

35MB40A

10

10

10

10

6x MJ15025

black

36mF/100V

+

U1-U4 to overcurrentprot.

white

U3

U1

U5

U2

U4

red

black

yellow

blue

connected
on input
connec­tor-board

MKP10

100n

-86V

U4

U4

U3U3

10K

+84V

MPS-A64

v

8,3mA

95K3

KP

1n5

MKP10

2u2

1,53mA

10n

2N5401

40K2

2V8

5K36

22n

v

3K01

715

1N4148
1N4148
1N4148
1N4148
1N4148
1N4148

100

0,8mA

to second
stage

3K01

(predriver)

-output

+output

60R4 60R4

2N6718 2N6718

1N4148

1N4148

v

LM 394

Dual-NPN

499

499

100

KP

20

0,8mA

v

100K

100

16,6 mA

>

4K3

22/60 USA

22n

330n

10u

ERO

MKC1862

NFB

+

14K7

MKP10

604

1N963B

12V1W

2N6718

2N6730

v

4,25mA

20

20

v

4,25mA

20

CR160

60R4

v

1,55mA

10n

-12V

20

100K

22n

2u2

MKP7

1n5

2N4392

100

+12V

62R4

D

G

S

100K

604

blue

100K

604

white

8,24mA

100

v

100100

10K

MPS-A14

-84V

2

-

3

1

10n

3,13mA

+

o

20K

2N5551

1N963B 12V

348

+

v

4K3

22/60 USA

16,6 mA

white

XLR-Cannon
connector fem.
bal input

green

2N6730

v

10,8mA

10n

>

Mark Levinson No 23
inputstage, voltageamp

Mark Levinson No 23
inputconnector-unit

=============

10n KP 470n MKS

2N6718

20

CR160

Chassis

v

1,55mA

60R4

20

+12V

100

2N5115

-12V

22n

S

G

D

blue

blue

=== ===

shorting
strap

black

100

100

100

U6

U6 U6

U6

U1U1U1

1N4003
1N4003
1N4003
1N4003
1N4003

330n

MKP10

3V

3mA

<

30

+84V

v

35,6mA

20

30

18K2

2N5551

324

-input

from -/+output
of inputstage

+input

+84V

10K

10n

MPS-A14

8,3mAv

2K

220

NPOcer

20K

330n

MKP10

20K

MPS-A64

2SA1006

10n

470

470

NPOcer

604
NPOker

MPS-A64

2SA1006

====

+

-

====

60R460R4

Vs1

2V-2V3

2N5401

KP

100100

+1V858

to buffer unit and
dynamic bias control

-1V793

1n

pos rail

+output

+output

neg rail

15,8mA

2SC2236

88R7

v

2K

1mA v

-84V

2SC2236

88R7

15,8mA

v

Mark Levinson No 23
second stage(predriver),
voltageamp

1K27

TIP127

1K

MKP10

680n

KP8

8n2

40R3

input

from pre­driver
output

10K

10n

150

MJE15030

10

200

MJE15031

150

10n

20

10

1N4936

1N4936

1N4936

10

white

U3

1N4936

1N4936

2N5551

10n

2N5401

10K

20

10n

10n

2SC2236

1N4936
1N4936

1N4936

2N5323

1N4936

1N4936

1N4936

1N4936

680/100

10

45R3

20

121

1K

1K

121

+

1N4936

5K62

5K62

2SC2236

1

+

140

470/10

33R2

33R2

470/10

+

140

1

10

.22

U1

red

yellow

U2

.22

Mark Levinson No 23
overcurrent
protection(currentamp)
dynamic bias-control

6x MJ15024

10

.22

.22

10

.22

.1

.1

.22

10

.22

.22

10 10

.22

.22

.22

.22

oker

(black)

200W8R

SPK3

2-8

700W2R

oker

(red)

10

MKP15

100n

U1

40K2

10K

input

from pre­driver
output

8n2
KP

TIP122

1K27

20

40R3

1N4936

1N4936

blue

U4

10

1N4936

1N4936

1N4936

10

1K

10K

20

2N5321

1N4936

20

45R3

1N4936

1N4936

2SA1006

680n

MKP10

1N4936

10

680/100

+

1

2SA1006

10

1

10

10

10

6x MJ15025

10

overcurrentprotection is allocated
on the input connector-board

white

black

?

Heatsink II

U3

U1

black

Heatsink I

?

U5

U2

U4

yellow

red

blue

10

connected
on input
connec­tor-board