Soldano x88r schematic

5

4

3

2

1

D D

SW1

C3

BRIGHT LEAD

R5
470K

0.0022

VR1
500K

C4

0.001

R6
470K

R7
100K

1

U2-1

C6

0.022uF

R9
470K

2

12AX7

3

C5

R8

1uF

1.8K

OI1A

VTL5C1

34

A

B

C C

J1
IN

2
4

1

R2
68K

R1
1M

R3

C13

220K

C2

0.047uF

6

U1-2

7

12AX7

8

R4

C1

1.8K

1uF

470pF

R21
470K

SW2
BRIGHT CRUNCH

VR6
500K

A

R22
100K

C14

R24

0.022uF

1

U1-1

2

12AX7

3

R23

2.2K

680K

OI2A

VTL5C1

R26

U4-2

220K

7

12AX7

34

R25
330K

8

R28

1.8K

B

R11

C7

100K

0.001

6

U2-2

7

12AX7

8

R10

R12

1M

39K

C8

0.022uF

R13
330K

R14
220K

6

U5-2

7

12AX7

8

R16

1.8K

E

R27
100K

6

C15

0.1uF

1

U4-1

2

12AX7

3

R29
100K

C16
470pF

R30
47K

C17

0.022uF

C18

0.022uF

VR7
250K

R31
330K

VR8
1M

VR9
25K

R15
100K

E

1

U5-1

2

12AX7

3

C9
1uF

R17
100K

C10
470pF

R18
47K

C11

0.022uF

C12

0.022uF

VR2

250K

R19
330K

VR5
500K

R20

VR3
1M

VR4
25K

680K

34

OI3A
VTL5C1

D

R44
220K

6

U6-2

7

R43
470K

1

U6-1

2

12AX7

3

12AX7

8

R46
82K

C25

0.1uF

R47

2.2K

R45

2.2K

J2

OUT

2
4

1

R32
680K

VR10
500K

OI4A

3 4

VTL5C1

C

VR11
500K

C

R40
100K

R36
100K

6

U3-2

7

12AX7

8

R37

2.2K

C20

0.022uF

C21
120p

R38

2.2M

R39
330K

1

U3-1

2

12AX7

3

R41

2.2K

C22
470pF

R42
47K

C23

0.022uF

C24

0.022uF

VR12
250K

VR13
1M

VR14
25K

VR15
1M

OI5A

3 4

VTL5C1

SW3

R33
470K

C19
470pF

R34
470K

BRIGHT CLEAN

R35
39K

B B

A A

Title

SOLDANO X88R

Size Document Number Rev

1 1

C

5

4

3

2

Date: Sheet of

1

1 1Friday, July 12, 2002

5

D D

F1
1A SLO BLO

J1
AC PWR

C C

3

1 2

SW1
POWER

Hammond 269BX

T1

1

4

5

150VAC

6

150VAC

8
9

6.3VAC

D1, D2 1N5368B

D1

D2

10

D1 and D2 depend on how much voltage the transformer is
putting out and might not even be necessary The voltage
measurement on C1 should be less than its voltage rating by
around 18-20V. This measurement is taken without connecting
the B+ supplies to tubes, but with filaments wired and
connected.

D3-D6 can be replaced with similar 1000V fast recovery
rectifiers

To minimize inductive coupling wire filaments in this order. F1 is the filament of V1

- +

B B

All voltages for switching circuits are specified relative to their
floating ground. This floating ground should NOT be connected
to the signal ground.

Footswitch capabilities can easily be added to this schematic by
putting a SPST switch before SW2 so that it could be turned off when
footswitch is enabled and wiring the gates of Q1-Q3 to a footswitch
connector. Alternatively a 4 position rotary channel switch can be
used with one position left unwired.

4

D3-D6 MUR1100E

D3-D6

- +

R9
100

R10
100

Vref

D7-D10

1N4007

F6

SWITCH/INDICATION
POWER SUPPLY

C8

+

4700uF 16V

R1
150K 2W

F5

F4

U1

7805

+432V

F3

C9

+

4700uF 16V

R2
1K 2W

+

F2

C1
47uF 450V

+

C2
47uF 450V

F1

+5V

SW2

CHANNEL

3

Filament reference supply

R3
1M

Vref

R4

C3

+

100K

100uF/100V

D11

R11
47K

3

6
1

2

Q1
2N7000

2

D

R5
10K 2W

R6
10K 2W

R7
10K 2W

R8
10K 2W

D11-D13 1N4148

LS1

4
5

8
7

OI5A
TLP227

A

+

C4
22uF 450V

B

+

C5
22uF 450V

C

+

C6
22uF 450V

E

+

C7
22uF 450V

LS1-LS3 - HASCO HS212 or similar

R13

R12

43

390

D14
CLEAN

LS2

4

3

5
6
1

2

Q2
2N7000

8

7

OI4A
TLP227

R16
180

OI2A
VTL5C1

R17
43

D15
CRUNCH

R15
390

D12

R14
47K

LS3

4

3

5
6
1

2

Q3
2N7000

8

7

OI3A
TLP227

R19
390

D14-D16 are red LEDs w 4V voltage
drop and 25mA current rating

D13

R18
47K

R20
180

OI1A
VTL5C1

1

R21
43

D16
LEAD

A A

Title

X88R POWER SUPPLY, SWITCHING AND INDICATION

Size Document Number Rev

2 1

C

5

4

3

2

Date: Sheet of

1

1 1Tuesday, August 20, 2002