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Bob McGilpin's "McMod"
A toneful new option for
T
he following
explains how
to add a 9 Henry
Mini-Choke to
Mercury's "Holy
Terror" Upgrade
Kit. It's a very easy
and worthwhile
modification to do.
And, it'll greatly
expand the tonal
range of your amp.
Bob wrote: "I
added a
Mercury 9 Henry
Mini-Choke to my
Holy
Terror. Why?
Because I now
Click on the above photo to see a movie produced by Bob McGilpin to
know that adding
demonstrate his "McMod."
a choke makes
an amp sound better. It makes for a smoother and
warmer sounding amp with a touch of vintage to the
amp's tone.
NOTE:
If you are adding Mercury's Mini-Choke after you've already made the "Holy
probably not be able to easily remove the circuit board. So, instead of removing the PCB, you may very, very carefully
drill small holes for self-tapping metal screws for the Mini-Choke. Mount and secure your Mini-Choke, pull the leads
through the hole, and then follow the instructions for removing the 5 watt 150W resistor and soldering your new Mini-
Choke into place. See the chassis diagram on the next page for the hole locations and sizes.
Orange "Tiny
Terror" • Mercury "Holy Terror" Upgrade Kit
This project and its documentation is the result of technical investigations made by the engineering staff of Mercury
Mercury's
by Bob McGilpin of
the furnishing of these documents does not constitute an expresed or implied license to use such materials.
"Tiny
Terror"
MV Amps
sound samples that you will you decide to take your
Holy Terror
Upgrade
Kit all the way by adding the
9 Henry Mini-Choke as well. It'll give you an even
Magnetics. The disclosure of the information herein may pertain to proprietary rights and
Upgrade
Why a 9 Hentry?
Well, the Holy
Terror runs at
about 15 watts,
close to a VOX
AC15. However
the original
vintage Vox
AC15 used a 10
Henry choke –
although the size
of the original was
quite a bit larger.
So I settled for a
smaller 9 Henry
Mini-Choke (an
innovation of
Mercury!).
"I believe when
you listen to my
Continued on page 44
Terror" Upgrade you will
Æ
41
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