QUAD 22 Schematic

SK1

RADIO 2

SK2

MIC

SK3

MONO

P.U.

SK4

Yellow

RADIO 1

SK5

Yellow

P.U.

SK6

Yellow

T.O.

SK7

Yellow

TAPE

R

C

1
2

R1

100k

R2 100k

SK13

Tape

Adaptor

Socket

9

7

SK13

STEREO MONO

2 MON

S1

A

P.U. Adaptor

1

Socket

Yellow

RADIO 1

1

4

3

RADIO MIC DISC TAPE

RADIO2 DISCS

S1

D

S1

E

SK14

S2

A

S2
B

RADIO 2
a

a

18
19

20
RV1A
RV1B

23
24

21
22

8

9

7

7

5
6

1

11

8

10

9

2

17

14

13

15

3
4

34

5

35

6

16

12

Redrawn By Keith Snook 1994 – www.keith-snook.info

Converted to Scaleable & Searchable pdf 2007 - update 2021.1

R20 47k

180V

R12

9

3

R14

2.7k

60V

1.4V

R16

270k

EF86

6

4

C34
20n

C5

22

R18

1.5M

V1

8

50V

470n

5

RV1A 500k

S2

S2

E

I

S2

J

S2

F

a

a

SK15

S2
M

S2
N

Blue RADIO 1

SK16

R11

100k

C3 100n

1.5M

b

b

225V

R23

470k

100V

1

2

3

C8

4

1.2V

R21

4.7k

12
13

10

14

11

ECC83

9

C10 22

R25 27k

C13

820p

(5n)

V3A

C12
16

25

26
27

C15 16

R26 1.5M

28
29

265V

200V

V3B

7

8

1.5V

R28

30
31

6

1k

32

16
17

R32 15k

R30
47k

C16

0.1

(50n)

V3B

ECC83

5

33

RV2A

34

RV2B

35
36

18
19
20
21

330V 4.5 mA

R37 12k

C18

5.6n

C19

5.6n

R33
39k

R34
68k

37
38

Bass

RV2A

500k

39
40

CANCEL

C24

220p

Treble

R39 330k

24
22
25
23

10kHz

FILTER

RV4A 250k

C26 220p

RV5A 100k

C22 3.9n

S3C

RV4A
RV5A
RV4B
RV5B

28
29

7kHz

5kHz

S3A

S3B

C28 3.9n

L1

Filter

Slope

41
42
43
44

30
31

R41
27k

C30

1.5n

R42
68k

S4A

R45 220R

R46 220R

S4B

Mains Input

Mains Output

Yellow

a a

45
46

OFF / ON

C32 47n

C33 47n

R

32
33

C

PL1

SK17

PL2

2

1

4

3
5

6

SK8

Blue

RADIO 1

SK9

Blue

P.U.

SK10

Blue

T.O.

SK8
Blue

TAPE

S1

B

S1

C

STEREO MONO

2 MON

R4 4.7k

S1

F

S1

G

S2
C

S2

D

R3

100k

RADIO MIC DISC TAPE

RADIO2 DISCS

LP1

Earth

Terminal

SK18

PL3

2

4

6

1

3
5

R7 10k

R10

4.7k

C2

5.1n

C4 100n

1.5M

S2

G

S2
H

R5

47k

R6

15k

C1

5n1

S2

S2

O

K

S2

S2

P

L

R8

100k

R9

82k

R13

9

3

R15

2.7k

60V

6

1.4V

R17

270k

V2

EF86

5

4

C35
20n

C6

22

R19

1.5M

8

50V

C9

470n

C7

RV1B 500k

16

100V

2

3

1.2V

R22

4.7k

1

4

R24

470k

ECC83

9

C11 22

C14

820p

(5n)

V4A

200V

6

7

8

1.5V

R27 1.5M

R29

1k

R31
47k

ECC83

5

Balance

C17

0.1

(50n)

V4B

RV3

12.5k

DRAWING No. B 11402 iss.4

Component values in ( ) are for pre Dec 1959 version

C20

5.6n

C21

5.6n

R38 12k

Bass

RV2B

500k

R35
39k

R36
68k

C25

220p

Treble

R40 330k

RV4B 250k

C27 220p

RV5B 100k

C23 3.9n

S3F

S3D

S3E

C29 3.9n

L1

Filter
Slope

R43
27k

C31

1.5n

R44
68k

QUAD 22 CONTROL UNIT

CIRCUIT DIAGRAM

a a

Mains Output

Blue

b b