Bugera G20 INFINIUM User manual

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G20 INFINIUM
Service Manual
Created: 02 July 2015
20-Watt Class-A Tube Amplifier Head with INFINIUM
Tube Life Multiplier, MORPH EQ and Reverb
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PCB Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Exploded Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

G20 INFINIUM
Specifications
- Hand-built 20-Watt Class-A amplifier driven by 2 x ECC83 and 2 x EL34 tubes
- Revolutionary INFINIUM Tube Life Multiplier technology:
- Extends the life of your amplifier’s expensive power tubes up to 20 times
- Provides incredible reliability and consistent tone over the complete lifespan of your tubes
- No need for expensive matched tube sets
- Allows you to mix and match any combination of compatible tube types and brands
- Monitors performance of the power tubes continuously and displays defective tubes to allow for easy
replacement
- Revolutionary MORPH EQ to seamlessly sweep between USA and British EQ-style tone
- Amazing classic push-pull power amp design for vintage tonal character
- High-definition reverb with dedicated Reverb control
- Heavy-duty footswitch for Channel / Reverb selection included
- Speaker-emulated output with 1 x 12 or 4 x 12 voicing option
- Impedance switch (4, 8 and 16 Ohms) to match virtually any speaker cabinet
- Effects loop with effects level switch
- Modern-style look and feel
- 3-Year Warranty Program*
- Designed and engineered by BUGERA Germany

PCB SchematicG20 INFINIUM
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PCB SchematicG20 INFINIUM
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PCB SchematicG20 INFINIUM
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PCB SchematicG20 INFINIUM
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PCB SchematicG20 INFINIUM
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PCB SchematicG20 INFINIUM
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Parts ListG20 INFINIUM
Page 9
Hi Pcb Assemblies
Quantity Unit S.Sku M.Sku Description Reference Designators Notes
1 1.0000 PC Q05-A5I00-07609 A05-A5I00-07609 PCB ASSEMBLY;P0A5I;REV:A;HAND INSERT;NO:828100
2 1.0000 PC Q05-B4001-00105 A05-B4001-00105 PCB ASSEMBLY;P0B40;PCB:1;REV:E;HI;MAIN
3 1.0000 PC Q05-B4002-00104 A05-B4002-00104 PCB ASSEMBLY;P0B40;PCB:2;REV:D;HI;REAR
Cable
Quantity Unit S.Sku M.Sku Description Reference Designators Notes
1 1.0000 PC A81-00000-56986 WIRE HARNESS;AWG:26;UL2468;2 MM;14;COMMON;PIN1
MARKING;70 MM;P1018-14P;A2006H
[P0B40:2: {1.0}(X8)]
2 1.0000 PC A81-27070-22822 WIRE HARNESS;LENGTH:270mm;ZEE;POLES:2;AWG:18;UL1015;ONE
SIDE 7mm STRIP/TINNED;PIN1 RD/OTHERS BK
3 1.0000 PC Q89-50031-04316 A89-50031-04316 FOOTSWITCH
CABLE;FS112;LENGTH:5000mm;POLES:3;COLOR:BLK;SPEC.NO:04316
4 1.0000 PC Q76-15222-06417 A76-15222-06417 CABLE;AC-
CORD;W/POLYBAG;LENGTH:152cm;AWG:18;VERSION;UL;SPEC.NO:0
6417
(UL)
5 1.0000 PC Q76-15212-03119 A76-15212-03119 CABLE;AC-CORD;W/POLYBAG;LENGTH:152cm;H05VV-F 3G
0.75MM2;VERSION;EU;SPEC.NO:03119
(EU)
6 1.0000 PC Q76-15042-05624 A76-15042-05624 CABLE;AC-CORD;W/POLYBAG;LENGTH:150cm;H05VV-
F3G0.75MM2;VERSION;UK;SPEC.NO:05624
(UK)
7 1.0000 PC Q76-00000-13573 A76-00000-13573 CABLE;AC-CORD;3;AR;1500 MM;Plug + Connector:321+730;H05VV-F
3G0.75
(AR)
8 1.0000 PC Q76-00000-05305 A76-00000-05305 CABLE;AC-CORD;3;BR;1500 MM;Plug + Connector:375+730;H05VV-F
3G0.75
(BR)
9 1.0000 PC Q76-18050-47490 A76-18050-47490 CABLE;AC-CORD;LENGTH:180cm;VERSION:SAA;PLUG:HE105
ISOLATED;SAA H05VV-F 3x0.75mm2;CONN.HP-3;SPEC.NO:47490
(SAA)
10 1.0000 PC Q76-15032-55649 A76-15032-55649 CABLE;AC-CORD;CLASS
II;W/POLYBAG;JAPAN;LENGTH:150cm;POLES:3;APPROVAL:PSE;JS15S
3 + VCTF 3x0.75mm2 + V1528
(HM, SH)

Parts ListG20 INFINIUM
Page 10
Capacitor
Quantity Unit S.Sku M.Sku Description Reference Designators Notes
1 2.0000 PC CAP E;100uF;10V;PITCH:2mm5;5mm x 11mm;VERTICAL 12.7-15-
9mm
[P0B40:1: {2.0}(C85,C91)] *NOT available in DP
2 26.0000 PC CAP E;47uF;25V;PITCH:2mm5;5mm x 11mm;VERTICAL 12.7-15-9mm [P0B40:1: {17.0}(C14,C18,C22,C27,C30-C31,C59-
C60,C63,C68,C73,C79,C92-C93,C122,C155,C175)]
*NOT available in DP
3 2.0000 PC CAP E;1uF;50V;PITCH:2mm5;5mm x 11mm;VERTICAL 12.7-15-9mm [P0B40:1: {2.0}(C11,C64)] *NOT available in DP
4 1.0000 PC CAP E;2uF2;50V;PITCH:2mm5;5mm x 11mm;VERTICAL 12.7-15-9mm [P0B40:2: {1.0}(C38)] *NOT available in DP
5 1.0000 PC CAP E;4uF7;50V;PITCH:2mm5;5mm x 11mm;VERTICAL 12.7-15-9mm [P0B40:1: {1.0}(C94)] *NOT available in DP
6 7.0000 PC CAP E;10uF;50V;PITCH:2mm5;5mm x 11mm;VERTICAL 12.7-15-9mm [P0B40:1: {5.0}(C19,C65,C82,C95,C140)] *NOT available in DP
7 2.0000 PC CAP E;47uF;63V;PITCH:2mm5;6mm x 11mm;VERTICAL 12.7-15-9mm [P0B40:1: {2.0}(C153-C154)] *NOT available in DP
8 3.0000 PC CAP CER;220pF;1KV;Y5P;10%;PITCH:5mm;DISC;VERTICAL 12.7-15-
9mm
[P0B40:1: {3.0}(C99,C166,C181)] *NOT available in DP
9 2.0000 PC CAP CER;220 nF;25 V;X7R;10 %;SMD603 [P0B40:2: {2.0}(C20,C30)] *NOT available in DP
10 1.0000 PC CAP CER;0.68 uF;50 V;X7R;10%;SMD1206 [P0B40:2: {1.0}(C27)] *NOT available in DP
11 3.0000 PC CAP CER;1uF;10V;+80% /-20%;SMT603 [P0B40:1: {3.0}(C97-C98,C149)] *NOT available in DP
12 1.0000 PC CAP CER;8nF2;16V;C0G;5%;SMD805 [P0B40:1: {1.0}(C129)] *NOT available in DP
13 1.0000 PC CAP CER;150nF;25V;X7R;10%;SMT805 [P0B40:1: {1.0}(C17)] *NOT available in DP
14 2.0000 PC CAP CER;220nF;25V;X7R;10%;SMT805 [P0B40:1: {2.0}(C24,C69)] *NOT available in DP
15 1.0000 PC CAP CER;470nF;25V;X7R;10%;SMT805 [P0B40:1: {1.0}(C1)] *NOT available in DP
16 2.0000 PC CAP CER;20pF;50V;20%;SMT603 [P0B40:1: {2.0}(C117,C128)] *NOT available in DP
17 3.0000 PC CAP CER;47pF;50V;5%;COG(NPO);SMT603 [P0B40:1: {1.0}(C7)] *NOT available in DP
18 3.0000 PC CAP CER;100pF;50V;20%;SMT603 [P0B40:1: {1.0}(C21)] *NOT available in DP
19 11.0000 PC CAP CER;220pF;50V;10%;SMT603 [P0B40:1: {2.0}(C26,C75)] *NOT available in DP
20 1.0000 PC CAP CER;470pF;50V;10%;SMT603 [P0B40:2: {1.0}(C36)] *NOT available in DP
21 11.0000 PC CAP CER;1nF;50V;C0G;5%;SMT603;(MURATA
GRM1885C1H102JA01D)
[P0B40:1: {11.0}(C9,C29,C53,C58,C105,C113,C119-
C120,C131-C132,C143)]
*NOT available in DP
22 1.0000 PC CAP CER;1nF2;50V;10%;SMT603 [P0B40:2: {1.0}(C13)] *NOT available in DP
23 1.0000 PC CAP CER;1nF5;50V;C0G;2%;SMT603;(MURATA
GRM1885C1H152GA01D)
[P0B40:2: {1.0}(C21)] *NOT available in DP
24 3.0000 PC CAP CER;2nF2;50V;C0G;5%;SMT603;(MURATA
GRM1885C1H222JA01D)
[P0B40:1: {3.0}(C66-C67,C144)] *NOT available in DP
25 3.0000 PC CAP CER;3nF3;50V;X7R;10%;SMT603 [P0B40:2: {3.0}(C2,C6,C18)] *NOT available in DP
26 1.0000 PC CAP CER;3nF9;50V;10%;SMT603 [P0B40:2: {1.0}(C19)] *NOT available in DP
27 3.0000 PC CAP CER;4nF7;50V;10%;SMT603 [P0B40:1: {2.0}(C74,C76)] *NOT available in DP
28 28.0000 PC CAP CER;10nF;50V;X7R;10%;SMT603 [P0B40:1: {24.0}(C2-C6,C13,C28,C32,C49-C50,C70-
C72,C80-C81,C83,C102,C115,C123,C156,C184-
C185,C187-C188)]
*NOT available in DP
29 1.0000 PC CAP CER;33nF;50V;10%;SMT603 [P0B40:2: {1.0}(C4)] *NOT available in DP
30 4.0000 PC CAP CER;47nF;50V;10%;SMD603 [P0B40:1: {4.0}(C8,C23,C56,C96)] *NOT available in DP
31 37.0000 PC CAP CER;100nF;50V;10%;SMT603 [P0B40:1: {24.0}(C33-C48,C54-C55,C112,C124-
C127,C130)]
*NOT available in DP
32 3.0000 PC CAP CER;470pF;50V;C0G;5%;SMD805 [P0B40:1: {3.0}(C15,C62,C172)] *NOT available in DP
33 1.0000 PC CAP CER;6nF8;50V;10%;SMT805;X7R [P0B40:1: {1.0}(C12)] *NOT available in DP
34 3.0000 PC CAP CER;22nF;50V;C0G;5%;SMD805 [P0B40:1: {3.0}(C16,C20,C57)] *NOT available in DP
35 1.0000 PC CAP CER;33nF;50V;X7R;10%;SMD805 [P0B40:1: {1.0}(C111)] *NOT available in DP
36 3.0000 PC CAP CER;4nF7;50V;X7R;10%;SMD805 [P0B40:1: {3.0}(C10,C118,C152)] *NOT available in DP
37 1.0000 PC CAP CER;68nF;50V;10%;SMT805;X7R [P0B40:1: {1.0}(C116)] *NOT available in DP
38 25.0000 PC CAP CER;100nF;50V;X7R;10%;SMT805 [P0B40:1: {25.0}(C25,C61,C84,C87-C88,C90,C100-
C101,C103-C104,C108-C110,C114,C121,C136,C139,C141-
C142,C146-C147,C157,C165,C173-C174)]
*NOT available in DP