Service Manuals, User Guides, Schematic Diagrams or docs for : . Rare and Ancient Equipment MADAMP A15 Madamp_A15
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All Voltages measured with respect to ground (except heater
voltage) at No-Load Conditions, Voltages may vary +/- 5%
R29 R36
240V 5K6 245V 3K9 B+
+ + C17
C10
47uF High Gain R25
++ + R33
220K
47uF
33K SW3b
R23 Boost
220K
R21 110V
6
100K R26
C11 C15 R30 C18
68K
2,2nF 22nF 220K 7 470pF
Treble
V3a
228V
1 ECC83 VR5
SW3a C13
R22 220K lin
++ + Boost 22nF
470K 2 R34
156V R31 8
V2b 47K C19 VR8
470K
R17 6 ECC83 22nF 1M log
R18 C12
2M2 1nF 1V
680k Bass
7 3V 3
R15 V2a
ECC83 VR6 Volume
470K 1M log
R19 R32 C16
Gain VR4 R28 C20
470k 8 R24 1K5 1uF
1M log 470K 22nF
R16 1M Mid
470K R27 C21
1,2V VR7
R20 C14 39k 22nF
1K5 22K lin
1uF
R35
470k
SW2b
Channel Power-
Switch 237V amp
R8 + C8 R10 R12 1
R3 C1 56K 47uF 5K6 1M
120K 10nF C4
330pF Clean V3b
ECC83
116V 2
R11
C7 470k
145V 22nF 123V 3
SW2a Treble R9
Channel 47K
6 Switch R5 R13 R14
R2 220K 1M 100K C9
Input J1 VR2
33K 1 47nF
7 220K 154V
V1a
lin
ECC83 Volume
2
C5 V1b
8 4,7nF ECC83
VR3
1,2V Bass 470K
R1
1M
C3 + VR1
log 3
MADAMP A15Mk2
220K 1,2V
47uF
log
R6 R7
+ C6 19.11.2008
1K5 47uF
R4 C2 SW1 10K
1K5 1uF Fat 2 Channel "American" Preamp
COPYRIGHT MADAMP / Martin Adams 2008
Rev 1.01 Page 1 of 2
B+ 262V
R48
C26 + 3K9
47uF
282V
3
R38
82K C23 R49
10nF 470 V5 4
5 6V6
288V
R55
8 1k
R39
TR2
100K < 35mV (Pa ca. 10W)
181V 171V R45 12 Draht
220K C27 J6
R51 10nF R57
C22 6 1 C24 1 680 16 Ohm
47nF 10nF
7 2 -21V SW4
V4 Smooth
Center
OFF J5
ECC83
+ ++ 6/7 4/15
8 3 8 Ohm
17V R52
R37 R40 R42 R41 C25
1M 1M 1 R53 R54 3/16
1M 680 100nF J4
18k 10k
16V R46
R43 220K 8 4 Ohm
J2 6K8 R56 13 1/18
5 1k
Return R64 2,8V V6 4
220k R44 R50 6V6
1K5 470
J3
R47 3
56K
Send R65
56k
53V 298V 290V
R60 R61
+
100 100
R59
C33 TR1 16
22uF 3 + C29
100 + C28 R58
6,3V 100uF 100uF 100K
18 AC
SW6
230V/50Hz Power
10 SW5 All Voltages measured with respect to ground (except heater
Standby C32
100nF BR1 voltage) at No-Load Conditions, Voltages may vary +/- 5%
230V
J6 12
F1 R62
F2 200mA -21 bis -27V
500mA 15
2k7 Bias
MADAMP A15Mk2
13 D1 VR9
C31 C30 R63 10K lin
7 5k6 19.11.2008
+ 47uF + 47uF
Power Supply & "American" 15W Power Amp
COPYRIGHT MADAMP / Martin Adams 2008
Rev 1.01 Page 2 of 2
Input Fat Bass Treble Volume Channel Gain ++ Bass Mid Treble Volume Standby SW5 Power SW6
SW1
J1 VR2 VR3 VR4
VR1
VR6 VR7 VR5 VR8
R1
C5
C12
R6
R23
1
C2
R5
R60
C4
+
R61
R65
C33
R63
E R29 C25 R44 + C30
+
R62
R35
D1
C31
R64
+ C10 C17 + G
C8 A B
C3
C6
C15
C1
C7
C26
R47
C18
C19
C2
R20
R22
R21
R32
C16
C23
C24
R11
R43
C11
C14
R16
C20
R17
+
R18
R7
+
R28
+
R25
+
R15
R3 R8 C13 R10 R34 R38 R39
R48
C28
R36
E
R58
+
R3 R59
0
R
R1
R33
2
R26
9
R9
+
C29
F
R31
R40
V2 V3 V4
R4
V1
D
R27
R24
R14
R13
R42
R41
~
C32
1 1 - +
1
1
BR
1 2 ~
R1
3
C G 7
10
TR1 12
13
15
6 4 3 1 16
12
7
13
15 16 18
1 1 18
R52
R51
TR2 V5 V6
VR9
C D
R55 R56 Bias
A B
J7
R49 R50 F2 F1
F Power Plug
R45 R46 Fuse Fuse
Socket
C22
C9
Red/White Heating
R37
Grey Shielded
MADAMP A15Mk2
7
C2
Yellow Power
R5
SW4 Red Bias
19.11.2008
3
R57
2 Channel "American" 15W Amplifier - Layout Plan
White Signal
R54
J6 J5 J4 J3 J2 COPYRIGHT MADAMP / Martin Adams 2008
Black Cathode
16 Ohm 8 Ohm 4 Ohm Send Return Smooth Blue Plate Rev 1.01 Page 1 of 1
Green Ground
rear
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