James May Engineering Ultra Tonic Pickup Einbauanleitung - Seite 4
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Seite druckenSet the exciter on top of the guitar behind the bridge, approximately in the center per Figure 4. The
position is not overly critical. The exciter has enough weight to properly couple to the guitar top, and
has a protective gasket to keep it from sliding and also keep it from marring the finish.
Find an adapter cable or use clip leads to connect a ¼" plug to your AC voltmeter. Polarity doesn't
matter. Plug the AC voltmeter into the output jack of the Ultra Tonic circuit board.
Set the signal generator to about 85Hz, and adjust the level so the guitar top can be clearly heard. If the
exciter starts to dance and wander around, it is too loud.
While observing the AC voltmeter and using your ears, slowly sweep the generator frequency up from
85Hz to about 250Hz and note where the two loudest hot spots are. These will correspond to the main
chamber resonance (typically 90-110Hz) and the main top plate resonance (typically 175-240Hz). After
noting which of these two hot spots is stronger, fine tune the signal generator back and forth to hone in
on it. When the meter reads highest, and it sounds loudest, then you've found it. If by chance both hot
spots are about the same level, then choose the higher frequency one. A typical meter reading will be in
the 30mV to 50mV range but could be higher or lower. The exact voltage reading is not critical. Leave
the oscillator set at that frequency.
With a small tool such as a pencil, pen or toothpick, flip the first of the 12 dip switches (switch 1, on the
far left) to the ON position and make note of the voltage meter reading for that switch. Make certain to
return the dip switch you just tested to the OFF position before progressing to the next switch. Set dip
switch 2 to the ON position, note its meter reading, and return it to the OFF position.
Repeat this procedure for each of the 12 dip switches. Whichever dip switch, when set to the ON
position, provides the lowest meter reading should now be flipped ON, and all the others set to OFF.
This will be the correct setting for the highest feedback suppression. Note the switch position number.
Let's call that position N. This will be the tentative final setting, subject fine tuning in the next section.
4. Compare the sound with and without feedback suppression, and fine
tune to taste.
While playing the guitar plugged into an amplifier, listen to the difference in sound between using the
feedback suppression and not using it:
Feedback suppression on (switch position N is on)
Feedback suppression off (all switch positions are off)
With feedback suppression off, the pickup will sound very much, if not exactly, like a K&K pure mini
pickup. It will have a lot of bass and probably be somewhat muddy in the low end, and a bit dull on the
high end. Try tapping on the top, and turn up the amp to get a sense of how easily the guitar feeds back.
With the feedback suppression on, the pickup should sound much clearer. The low end mud should all
be gone, and the top end should sound a little brighter. Check the feedback sensitivity. Typically, it will
now have at least 10dB more gain before feedback at the main chamber resonance of 90-110Hz. The top
will be much less responsive, but should still be usable for tapping effects.
Next, compare the sound with switch position N engaged to the sound with nearby positions N-1, N+1,
or N+2 engaged. N-1 will have somewhat less bass. N+1 or N+2 will have somewhat more bass, but a
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