Mercury Epiphone Valve Junior, Инструкция по сборке

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18
Epiphone Valve Jr.
•
Mercury Upgrade Kit
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.
R
ead the this manual BEFORE beginning the
Upgrade . In that way you’ll be more aware of
what’s required and whether or not it is within your
ability. Also, be sure to read through the various
appendices for helpful hints and tips. If you have
any questions, please do not hesitate to call us here
at
Mercury Magnetics
!
OUTLINE
You’re about to strip your stock amp and prepare it for
the
Mercury Upgrade
. It’s good practice to place all
of the components you remove into holding containers
so they are easy to locate and won’t get lost. Most of the
components you are stripping will not be used again. But
hold onto everything for now until your
Upgraded
amp
is up and running.
Let’s get started:
1. Unplug the amp from the power source (AC).
2. Remove all chassis retaining screws from the back
and the two on the top of the amp.
3. Remove the chassis from the amp – disconnect the
two speaker wires first.
4. Discharge the capacitors.
5. Remove the following from the Main PCB (printed
circuit board):
a. Tubes
b. Transformer clips
c. Unbolt the main PCB.
d. Unclip and/or unsolder all other direct connections
to the main PCB.
e. Unbolt and remove the stock output and power
transformers
Special note : The solder used in these amps is
RoHS compliant – a term for a new industry standard
that basically means the solder is lead-free. This
also means that you’ll need to use a good quality
iron running hotter than traditional solder melting
temperatures (set it for about 800° F) – RoHS
compliant solder melts at higher temps than the
original soldering alloys but it’s likely you’ll be using
regular electronics solder for this project. You may also
want to do a web search to study up on working with
RoHS solder.
For drilling or resizing holes we recommend that you use
a Dremel Tool with a 1/16" bit. A hole reaming bit will also
come in handy to enlarge existing holes. And a small
grinding head will serve as a trace-cutter. A sharp pocket
knife or Exacto is recommended for scraping away PCB
insulation to reveal traces.
See appendixes for special instructions regarding trace
cutting, trace revealing, and adding jumpers.
6. Use the illustrations as a reference to strip the main
PCB in this order:
a. Unsolder items
b. Hole drilling and enlarging
c. Cut traces
d. Reveal traces
e. Add jumpers
7. Carefully compare your stripped and modified
Main PCB so that it matches the illustrations in this
Sequence. A missed step or mistake will bite you later
on. Take your time to do a methodical and thorough
approach.
8. The chassis needs to be modified to hold the
Upgraded
power and output transformer and the
Mini-Choke . If you will be adding the 6V6 Mod , you’ll
need to add the tube socket as well. Reference the
chassis template, make the modifications and bolt on
the transformers and Mini-Choke. If you’ll be adding the
6V6 Mod, see the special section regarding how.
VERSION 2 & 3 PCBs ONLY!
An Overview of the Upgrading Process