Randall mark ii schematic
Note: This schematic page is for
both the left and right channels.
The “-” in the reference
designator is replaced by “1” for
the left channel and “2” for the
right channel. For example:
R109 = 180K for left channel
R209 = 180K for right channel
V-01
6SJ7
J-01
Input
0.0V
R1
100K
(Left and Right
channels ganged)
4
8
1
R-01
2.32K
278V
5
R-03
42.1K
161V
3
6.7V
C-02
.22 µF
6
.22 µF
C-0X
47 pF
C-03A
47µF
C-01
R-02
137K
18K 1W
6SN7GT
0.0V
1
R-05
619K
C-05
.012 µF
R-04
V-02
2
193V
3
5.7V
4
R-06
511
306V
C-04
.22 µF
R-07
10K 3W
.47 µF
5
6
C-06
C-03B
47 µF
0.0V
R-11
330
R-9
180K
R-8
2.2K 2W
C-09
.47 µF
2 x EL34/6CA7
R-13
1K
3
1
5
V-03
C-07
1500 µF
4
33V
8 8
C-08
.47 µF
R-17
7.5K 3W
C-10A C-10B
R-12
330
150
1W
R-15
5
100 µF
413V
R-14
3
R-10
270
10W
434V
1K
V-04
444V
L-01
4.0 H
Blue
T-01
UBT-1
Brown
R-18
150
1W
1
R-16
4
To filament supply
(see Power Supply
27Ω
5W
schematic)
Brown
Green
Yellow
Black
F-01
0.5A
J-05
J-04
J-03
J-02
C-11
.039 µF
+
444 VDC
155 mA
Speaker
Output
16 Ω
(White)
8 Ω
(Green)
4 Ω
(Yellow)
COM
(Black)
Ground
Unless otherwise noted, all resistances are in ohms.
All resistors are 1/2W unless noted.
Quiescent DC operating voltages relative
to ground are shown in italics.
The Randall Amplifier
Amplifier Sections
rev 2.0, 6/17/98, John Atwood
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