TGA-3 100 Watt Guitar Amplifier User’s Guide
Effects Loop Controls
The front panel controls for the effects loop are: FX send/submaster (yellow for channel 1 and red for chan
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nels 2 and 3), the stereo FX loop returns (blue). The input and output level controls and switches of your effects
unit(s) must also be set properly. If your effect has a gain or level switch, it is best to set it to high, line level, or
+4dB. Next, set the FX send/submaster controls for channel 1 and channel 2-3 to 12 o’clock. Connect the input
to send and the output to return. Start with your effect’s input level down and, when you power-up, adjust the
level of your effect to stay ‘out of the red’. Turning up the stereo FX loop returns, left and right, will affect the
overall amp volume (more on these controls later in this manual). Note: The Demeter has a lot of attack tran
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sient response, and responds dynamically to picking strength and pickup volume. The input level meters (or VU’s)
on some effects are too slow to read your guitar’s transient attack, which can be twice as loud as the sustain.
If you experience unmusical distortion or ‘break-up’ of the signal, and the input level is ‘in the green’ try back
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ing off the input level a notch or two or, turn down the FX send/submaster a bit, to make sure you really have
sufficient headroom.
Slave Amp Output
To the right of the stereo return jack is one marked output to slave amp. This is for true stereo operation with
another power amplifier. The TGA-3-100 will work well in stereo with another high quality guitar power ampli
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fier. However, to achieve true matched stereo sound, we recommend the Demeter STGA-1 for most balanced tone
and output, without redundant controls. The TGA-3-100 becomes the master control for both amplifiers in
stereo mode, with the (blue) stereo FX loop return, right channel, controlling the volume of the slaved amplifier.
The slave amp output also can double as a line out to a miking board or sound system.
Rear Extra Input
To the right of the slave out is an accessory/extra input for convenience when rack-mounting the TGA3-100 (a
rack-mounting kit is available). Both inputs can be used simultaneously, and both share the same input channel.
Footswitch Operation
Further right are the footswitch jacks. Provisions are made for both ‘conventional’ footswitches (latched
grounding type) and the optional FS-1 footswitch with tricolor L.E.D. indicators. The FS-1 connects to the 5-
pin XLR jack on the far right of the rear panel. The switching method is compatible with most MIDI switching
boxes, such as the Rockman MIDI Octopus, etc. Channel switching can also be done from the front panel by using
the 3- position rocker switch on the far left. Note: this switch should be in the center position when using any
footswitches.
The footswitches work as follows: two latched, grounding-type foot switches are connected to the two channel
switching jacks, one labeled clean, the other dirty/edge. When the clean switch is on the amp is in channel 1 and
the other switch has no effect. The dirty/edge switch toggles between channels 2 and 3, so switching the clean
channel off gives you what ever setting you have preset with the other switch. This way, you have three preset
sounds and volume levels from two switches. This makes very wide dynamic changes possible in a single move.
The FS-1 footswitch works identically, but has a yellow and a red-green L.E.D. to indicate status. It combines
both the footswitches in a single box.
6900 Kingsbury Road | Templeton, CA 93465 | 805-461-4100 | http://www.demeteramps.com/
