ST-200 Features
True Strobe Display - Easy to read display instantly shows the slightest difference in
pitch of the note played from the indicated note. The ring of LEDs is a true stroboscope,
driven directly by the analog input signal and a precision internal frequency reference. This
gives zero latency and instantly shows the slightest tuning error.
True Bypass / Muted Output - The output of the ST-200 is muted when the tuner is
on, and when off the input signal is passed directly to the output. It is completely
disconnected from all internal circuitry and the tuner puts zero load on the signal.
Extreme Accuracy - The internal timing generator is calibrated at the factory to
maintain a precision of ±.02 cents.
Chromatic Mode - Permits tuning to any of the 12 notes from C0 to C8, in any
temperament. In this mode the note display shows the note name (A-G#).
Open Tuning Modes - In open tuning mode, the tuner only selects notes that are
defined for the particular tuning, and the note display shows the string number instead of
the note name. For example, standard guitar tuning has six notes, E4, B3, G3, D3, A2 and
E2. These are displayed as string numbers 1-6.
Power On Restore - The ST-200 remembers the settings for mode, drop tuning and
A4 changes. No battery is necessary.
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Flat Tuning - Lowers all pitches up to six semitones.
Reference Pitch Change - By default, the tuner uses A4=440Hz as the reference
pitch. This can be changed in increments of .1Hz, over the range of 300.0 Hz to 599.9 Hz.
Temperaments - The ST-200 can operate in the equal temperament or any 12 note
temperament the user desires. The ST-200 can store a total of 5 different temperaments, in
addition to the equal temperament.
Battery or External 9 Volt Operation - The Turbo Tuner ST-200 can operate for 12
hours continuous from a standard alkaline battery. This is enough for about 1,000 tune ups.
It also works with any 9 Volt adapter designed for stomp boxes.
Low Battery Indication - When there is about a half an hour of battery life remaining,
a low battery warning is shown on the note display every 2 minutes.
The low battery indication is the following 5 characters displayed in rapid sequence in the
note display:
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Tuning Tips
The Turbo Tuner is designed to respond quickly to the notes from your guitar without
resorting to adjusting the volume or plucking the string differently than you normally
would when playing.
The single most important tip:
Mute the strings not being tuned by resting your fingers on them. This will eliminate
sympathetic vibrations and give a quicker response and a cleaner pattern in the strobe
display.
The Turbo Tuner's true strobe display responds to all the harmonics of the note as well as
the fundamental, and the more harmonics, the more complex the display. This does not
affect the operation of the tuner. There are several things you can do to reduce the
harmonics and get a cleaner looking display:
1.Selecting the pickup closest to the neck will give the clearest pattern. You can also
back off the tone control for even greater clarity on the bass strings.
2.Plucking away from the bridge gives a clearer pattern than right next to the bridge.
Also, try plucking the string with the side of the thumb rather than a pick.
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Changing the Reference Pitch
The default reference pitch is A4=440 Hz. This can be changed in .1Hz increments to any
value from 300.0 Hz to 599.9 Hz.
To change the reference pitch, press and hold the CAL button while turning the tuner on.
The A4 LED will flash, and the current setting of A4 will scroll through the note display.
For example, assuming the tuner's reference is set to 440.0Hz, the display would scroll
through the following sequence:
A = 4 4 0 . 0
ààà à à à à
You may then press the CAL button to scroll through the current setting, and use the FLAT
button to change each digit.
After the desired value has been entered, press the CAL button to scroll through the display
until the note display is blank, and press the FLAT button. The tuner will now resume
normal operation.
Whenever the A4 reference is set to anything other than 440.0 Hz, the A4 LED will be
illuminated. 11
L o b a t
ààà à àNormal Operation
