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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.
Tips ’n Tricks for
Reducing RF & Other Noise in the Circuit
A little finessing is needed to reduce RF and other noise. A correctly set up
Mercury Upgraded
Valve
Jr.
should be almost stone-quiet. If you already have a quiet amp, your done! If not, read on.
Here’s a few noise-reducing recommendations:
1. With the amp powered-up, turn its volume control off and unlplug the guitar.
2. Listen. Do you hear an unusual amount of extra noise?
3. The key to reducing noise is the layout of the wiring. Looking at the supplied photos of a finished amp,
you’ll notice patterns as to how the filament leads and other leads are twisted together. How some are
not twisted. Their lengths. The use of wire ties, and the positions of others.
4. The filmament wires should be as evenly twisted as possible—about 10 twists per inch. Symetry is
important.
5. Try to follow our examples as closely as possible.
6. The
output transformer’s
primary YELLOW lead is another source of noise. Keep it under and away
from as many components and other leads as possible, but close to the chassis.
7. Make sure that the twin RED B+ leads from the PT are NOT TWISTED together.
Tips ’n Tricks for
Drilling the Tube Socket for the 6v6 Mod
To create the proper-sized hole for the 6V6 tube socket, you’ll need varibit or stepped drill bits similar to these.
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