day 1949 User Manual
1MΩ
0.5W
C
polystyrene
R
1
in
8.2nF
AOT
10
C
R
0Ω
26
a a
220Ω
0.5W
R
2V
4
22kΩ
R
1W
5
C
(MKP) bypass capacitor which may
improve high frequency definition!
Redrawn in the original stlye by Keith Snook
Redrawn in the original stlye by Keith Snook
The Williamson Amplifier “new version”
The Williamson Amplifier “new version”
from Wireless World August 1949 p. 282
from Wireless World August 1949 p. 282
d.c. ~ daylight ltd
d.c. ~ daylight ltd
Items marked in orange are changes
*
= 1.0µF — 4.7µF Polypropylene
from the original schematic
*
220nF
630V
4
170-180V
C
C
500V
47µF
V
4
V
1
C
1
a a
470kΩ
0.5W
47kΩ
2W
ECC81
87-107V
R
9
180Ω 0.5W
a a
R
13
V
2
85-105V
R
10
2V
ECC81
470kΩ
0.5W
a a
47kΩ
2W
2W
R
8
11
R
1W
310-320V
R
7
C
*
ECC81
170-180V
33kΩ
2
500V
3
4
500V
R
1W
47-100µF
V
+V
47-100µF
22kΩ
R
6
Williamson KT66 valve amplifier practical
application using ECC81 double triodes
C
2
C
5
420 - 440V
22kΩ
1W
200-210V
220nF
630V
3
310-320V
C
47kΩ
R
3
V
3
220nF
630V
100Ω 1W
C
7
1kΩ 0.5W
R
24
all other resistors 5%
R
4
and R
25
1%
.
.
68-100µF
500V
C
8
KT66
330kΩ
0.5W
R
19
100Ω
R
18
R
100Ω 2W
a a
21
2W
R
17
150Ω 3W
R
22
100Ω 1W
R
20
V
6
0.5W
100Ω 1W
a a
35-40V
16
R
330kΩ
R
14
1kΩ 0.5W
630V
R
15
220nF
C
6
100Ω 1W
23
R
C
*
CH
1
1kΩ 1W
R
( Sowter 8609 )
30H > 20mA
CH
1
V
5
KT66
440 - 460V
C
0V0V
*
1.2kΩ√Z
4.7kΩ 0.5W
Output
R
15
out
0V
6.3V @ 4A
T
2
( Sowter 8950
(may be electrolytic)
set to 15Ω )
8-22µF 630V
C
9
220nF 630V MKT
180nF 630V MKT
for 50Hz mains
for 60Hz mains
C
hum
( Sowter CA15 )
10H > 150mA
CH
2
a
<4.7Ω 1W resistor
prevent hum loops
and // capacitor to
This link may be
replaced with
a
E
@ 150mA
425V
mains
in
N
a.c.
L
@ 150mA
425V
V
7
F
1
315mA AS
@ 3A
5V
T
1
daylight.ltd.uk for original
original -shown in blue- as it
valves, refer to: www.dc-
contains changes from the
was built using ECC81
Note: This schematic
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