Epiphone Valve Jr.
•
Mercury Upgrade Kit
23
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.
FINAL WIRING (
without
6v6 Mod)
1. Thread the various transformer leads through
the holes as indicated in the diagrams.
2. Solder the orange filament leads from the
PT into positions at the V2 tube socket. Note
that these leads must be tightly twisted (see
appendix).
3. Solder onto T1 and T2 the red leads from the
PT.
4. Solder the black and yellow PT leads onto the
On/Off switch.
5. Solder the orange/white-striped center tap
lead from the PT and the ground chassis
lead to the back of the board (see special
instruction page).
6. Solder the green and black secondary leads
from the OT to the speaker jack as indicated.
7. Solder the black primary OT lead to T4.
8. Solder the yellow primary OT lead to T3.
9. Solder the Mini-Choke’s leads to the locations
designed on the Main PCB.
10. Bolt the Main PCB back into the chassis.
11. Connect the input jack and volume control
leads to their jacks on the Main PCB.
Triple-check your modifications. If you have any
questions the time to get them answered is now.
Call
Mercury
if you are in doubt about anything.
Finish re-assembling the unit, including reinstalling
the tubes, putting the chassis back in the case,
hooking up the speaker, etc.
DO NOT BYPASS THIS NEXT STEP!
After triple-checking your assembly, connect the
amp’s power to a
Variac and amp meter
, or even
better, a variable AC power supply, and follow
the testing/start-up proceedure as outlined in this
manual’s appendix.
Debug if necessary and repeat this process
until you are satisfied that the
Upgraded
amp is
working correctly.
When the amp is working to your satisfaction use
the cable ties (supplied) to group and hold the
various wires away from the Main PCB (especially
the tubes). In particular, gather up Filament
Supply Leads tying them as close to the
power
transformer
as possible. See final photographs for
examples.
Apply
Loctite 290
(green) to the two retaining bolts
and screws of the Main PCB.
Apply the
Mercury
metal place to properly I.D.
your
Mercury Upgraded
amp. And you are done!
Summary of Contents for Epiphone Valve Junior
Page 1: ...VERSION 012011 ...
