Mercury Epiphone Valve Junior - Valve Junior Head 6 V6 Mod Schematic; 6 V6 Mod and Filament Connection Details

Epiphone Valve Jr.•Mercury Upgrade Kit 15
ThisprojectanditsdocumentationistheresultoftechnicalinvestigationsmadebytheengineeringstaffofMercury Magnetics.Thedisclosureoftheinformationhereinmaypertaintoproprietaryrightsand
thefurnishingofthesedocumentsdoesnotconstituteanexpresedorimpliedlicensetousesuchmaterials.
B2
PRI
SEC
B1
B3
B1 B2 B3
680ρF
47ρF
SQUEAL BYPASS
OPTION
B3
.022µF
100KΩ
1.5KΩ
2.2KΩ
4Ω
8Ω
16Ω
1.5KΩ
1.5KΩ
250-750ρF
220KΩ
220Ω 2W
470Ω
22µF
(AC to filaments)
B+
3.3KΩ 1-2W 10KΩ
22µF
10µF
22µF
1MΩ
68KΩ
470KΩ
220KΩ
RC NETWORK
6V6 MOD OPTION
100KΩ
1MΩ
1MΩ
100KΩ
.022µF
22µF 22µF
22µF 22µF
Mercury
Magnetics
Axiom®
EPJR-P
power
transformer
Mercury Magnetics
Axiom®
EPJR-C-3H
Mini-Choke™
R12 R13
C9 C6
C12
C7
B3
.1µF
C11 C8
R10
= Modification
= PCB location
= Squeal bypass
22-47µF
25V
Mercury
Magnetics
Axiom®
EPJR-OM (head)
output transformer
R2
R1
R8
R3
V1B
C1
R6
C11
R16
R7
R4
R15
D1-4
R14
R5
C2
V2
7
9
3
2
8
4
3
5
C3
C5
R9
VR1
V1A
C4
12AX7
12AX7
12AX7
EL84/7189
6V6
12AX7
VERSION: 05-09-06 (original)
6V6 REV. 07-28-08 (updated)
REV. 12-02-10
Valve Jr. head • Mercury Upgrade with 6V6 Mod
This project and its documentation are the result of technical investigations made by the engineering staff of Mercury Magnetics. The disclosure of the information herein may pertain to proprietary rights, and the furnishing of these documents does not constitute
an expressed or implied license to use such materials. Copyright © 2006–9 by Mercury Magnetics. All Rights Reserved. Axiom and ToneClone are registered trademarks of Mercury Magnetics. Mercury Magnetics, “The Heart & Soul of Your Amp,” FatStack & Mercury
Vintage are trademarks of Mercury Magnetics. Epiphone is a registered trademark of Gibson Guitar Corp. or its subsidiaries.
Mercury Magnetics is not affiliated with Gibson Guitar Corp.
FILAMENT CONNECTION
TYPE EL84 6V6*
*You can use 6V6, 6L6, 6550, etc.
PINS 4 & 5  2 & 7
(Alan Cyr / Mercury Magnetics • Version 2 & 3 PCBs)
9167 Independence Ave., Chatsworth CA 91311 • (818) 998-7791
www.MercuryMagnetics.com • www.Amp-Exchange.com
12AX7
1
2
3
4
5
6
7
8
9
HT 2P
2G
2K
H
H
IP
IG
IK
6V6
3
2
1
8
7
4
5
H
Nc
K
H
P
G2
G1
EL84
1
2
3
4
5
6
7
8
9
Ic
G1
K
H
H
Ic
P
Ic
G2