450V
R
1MΩ
0.5W
CH
R
6
R
2
33kΩ
1W
320V
100V
C
8µF
450V
1
R
47kΩ
1W
3
L63
V
1
a a
1
R
470Ω
0.5W
4
22kΩ
1W
R
22kΩ
1W
a a
C
7
215V
V
2
R
5
22kΩ
1W
2
8µF
450V
L63
105V
C
0.05µF
350V
R
8
470kΩ
0.5W
R
9
470kΩ
0.5W
C
0.05µF
350V
3
4
V
3
a a
R
10
390Ω 0.5W
a a
V
4
L63
L63
R
39kΩ
2W
R
25kΩ
1W
R
13
39kΩ
2W
12
C
5
8µF
450V
C
6
0.25µF
350V
R
11
14
0.1MΩ
0.5W
R
19
0.1MΩ
0.5W
C
7
0.25µF
350V
R
100Ω 1W
R
1kΩ 0.5W
R
16
100Ω 1W
R
17
100Ω
2W
R
18
100Ω 1W
R
1kΩ 0.5W
R
100Ω 1W
1
30H > 20mA
23
15
R
21
100Ω 2W
20
24
KT66
V
5
a a
R
22
150Ω 3W
a a
V
6
KT66
550V
C
8µF
8
0V
CH
10H > 150mA
T
2
2
Output
R
1.2kΩ√Z
0.5W
15
C
8µF
600V
out
9
0V
V
425V
@ 150mA
425V
@ 150mA
a
6.3V @ 4A
a
5V
@ 3A
7
U52
T
1
F
1
315mA AS
a.c.
mains
in
L
N
Design for a high Quality Amplifer
Design for a high Quality Amplifer
“ The Williamson Amplifier ”
“ The Williamson Amplifier ”
from Wireless World May 1947 p. 161
from Wireless World May 1947 p. 161
Redrawn in original form by Keith Snook
Redrawn in original form by Keith Snook
d.c. ~ daylight ltd
d.c. ~ daylight ltd
.
.