88

7

7

6

6

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

VIBRATO BEND

POWER

REVERB

DepthSpeed

Reverb

380Vdc

350Vdc320Vdc

270Vdc

270Vdc

-25Vdc

6.3Vac

30Vac

300Vac

STEELPHON "PIONEER"Italian Vintage Amplifier

Redrawn from original schematicby Valmer

MAIN

AUX

SUPPLY

11/01/2010

4ohm

8ohm

16ohm

Volume

Volume

Treble

Bass

Bass

Treble

solderjumper

Remote

grey

green

red

RedBlackBrownOrange

White Black

Rev. 1.2

F1 F2

F2F1

F1 F2

F2F1 F2F1

F1 F2 F2F1

F1

F1

-Bias

+HV1+HV2+HV4

+HV4

+HV4 +HV4

+HV4

F2F1

F2F1

F2F1

F2F1

-BiasF1 F2

F1F2

+HV3

+HV3

+HV4+HV3 +HV3 +HV3

+HV2

F1 F2

F1 F2

F1 F2

+HVRev

+HV4+HVRev

+HV3

-Bias

C19 150pF

R82

3.3k/2W

P2

220k

J5

PHONEJACK

21

43

R1522k

R25 4.7k

C5

150pF

R42

1k

R7410M

R83 1.5k/5W

R3 68k

C8 330pF

+ C442x50uF/500V

P9

C10

47pF

V6-2ECC83

2

3

1

+C37

25uF

SW7 POWER ON

R221k

R49

10k

P4

220k

V9

EL84

2

3

7

9

R39

100k

V6-1ECC83

7

8

6

C30 150pF

C12 100nF

C48470nF

R30

470

R641k

+

C42

100uF

R68 2.2M

R810k

R19100k

V1-2

ECC83

2

3

1

R86 330

R85 5.6/2W

C29

22nF

R2

1M

V3-1

ECL86

1

2

9

R56

1M

R37

1.5k

C9 100nF

R45

10k

R51 270k

R61

10k

R54 100k

R55 68k

R31 4.7k

+C17

25uF

R47

1M

P1

220k

C26

47pF

R38100k

+

-

DB1

4xBY250

R73

10M

C2

10nF

V3-2

ECL86

8

7

6

3

R13 220k

R29

470

C13

100nF

R33

470

R41 3.6k/5W

280220160145125110

SW8SELVOLT

V2-1

ECC83

7

8

6

J6

AC

R59 1M

C31

33nF

P5

220k

R76 2.2M

TR1500

R16 1M

R40

270R36

1M

SW6 STAND BY

R46 100k

+C1

25uFR11

1.5k

R691M

C32 10nFSW1

BRIGHT

R80

1.5k/5W

C11

1nF

R12100k

R7100k

V4-1

ECC83

7

8

6

J1123

C7

10nF

R70270k

R67 2.7k

+C39

50uF/500V

R26 1k

V2-2

ECC83

23

1

+C41

2x50uF/500V

R4 1M

R34

470

+

C228uF/500V

+C33

25uF

R53 12k

R5

1.5k

+C6

25uF

R231k

V4-2

ECC83

2

3

1

R62 100k

R57 68k

R1 68k

V1-1

ECC83

7

8

6

R91M

R48 100k

V7

EL84

2

3

7

9

TR2 300

F1 1.2T

V8

EL84

2

3

7

9

R72 2.2M

C28 10nF

C4

33nF

R27 1k

R171M

R60100k

C3

22nF

C20

47nFD2

J2123

C15 10nF

+

C43

100uF

J7DIN5F

3 1

2

V10

EL84

2

3

7

9

D3

R79

1.5k/5W

C47 10nF

J4123

SW4/1

BEND

P3

1M

R66 220k

C18 10nF

P7

R77PHOTORES

V5-2ECC83

2

3

1

C34 22nF

R65

1.5k

T1

Line Trafo

R81

10k/1W

R87 330k

LP1 LAMP

V5-1

ECC83

7

8

6

P8

R78

330/2W

+C23

50uF/500V

R20 100k

R2447k R28 4.7k

D1

BY114

P6

1M

R752.2M

+C40

50uF/500V

R18 470

SW2 REVERB

R101k

R52270k

C16 100nF

R84 1.5k/5W

C35 33nF

R6

100k

R2147k

R71100k

J3123

F2

0.5T

R44100k

+C21

8uF 350V

R58

1.5k

C25

47pF

R32 4.7k

R43

1.5k

C24 330pF

T2

Out Trafo

+C27

25uF

REV

REVERB

4

5 8

1

R50

100k

R63

1M

C36 10nF

+C33

25uF

SW4/2

LP1 LAMP

R14470

R35 10k

SW3

BRIGHT

C45a 4700pF

C45b 4700pF C46b 4700pF

C46a 4700pF