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The Gain control acts as an effects send level control. The amount of signal present at the
Effects Send jack is governed by the Gain control on the front panel. If your effects unit is over-
loading and it does not provide for compensating incoming signals (such as an input volume or
switches marked +4 or –10, for example), you may turn down the Gain control to avoid the over-
loading. If your effects unit has input level adjustments, they should be set for either 0 dB or +4
dB.
The Stereo Master Volume control may be used to recover losses in gain caused by some effects
units.
Use the Effects Blend control to adjust the amount of effect with the natural signal from your
instrument. No sound from your effects unit will be heard if the Effects Blend control is in the
fully counter-clockwise ("dry") position.
To use the mono Effects Loop, run a shielded patch cable from the SM-500's "Send" jack to the
INPUT of your effects unit. Run a second patch cable from the OUTPUT of your effects unit to the
SM-500's mono effects return jack. Then adjust the Effects Blend control for the mix you desire.
To use the stereo Effects Loop, run a patch cable from the Effects SEND jack to the mono input of
your stereo effects unit. This generally is either the left or right input of the unit (check your own-
ers manual). If for some reason your effects unit does not provide a mono input, purchase a "Y"
mono cord from your local music or electronics store. Plug the common end in the effects Send
jack and the other two ends in the left and right inputs of your effect.
If you wish to use just the internal power amps in the SM-500, the Effects Return jacks will serve
as the "inputs." Insert your MONO signal source in the mono Effects Return jack. This will send
the source to both power amps. If you have a stereo source, plug the left and right outputs into
the corresponding Effects Return jacks. If you want to use just one side of the amp, use the LEFT
CHANNEL ONLY. This is because the thermostat that regulates the fan is located on the left side.
TUNER OUT
The Tuner Out jack allows the user to connect an instrument tuner and tune up without having to
unplug and go back and forth from amp to tuner. This feature is totally isolated from the rest of
the preamp and will function regardless of the settings of any control on the front panel. Being on
a side chain (isolated) also avoids loading down of the instrument causing a loss in dynamic
range.
To use this feature, plug in a shielded patch cord from the Tuner Out to the INPUT on your tuner.
Turn the amplifier on and you're ready to go. If you do not wish to monitor your sound while tuning
up, set the Speaker On/Off switch to the "Off" position.
BALANCED XLR OUT
The Balanced Out is a true balanced output and serves two functions. In the "Direct" position,
the XLR is essentially an active tube direct box. The signal is taken directly from the input jacks.
No controls on the front panel affect the sound, volume or content of the signal. In the "Line"
position, ALL controls on the front panel (with the exception of the Effects Blend and Master
Volume) function and affect the signal. Output level in the "Line" position is determined by both
the Gain and XLR pad. When using this switch, make sure it is all the way to one side or the
other and not in a "half way" position, as this could result in no output.
The "Line" position can be used for recording directly into a tape machine as well as going direct-
ly to the studio board. An external power amplifier with a balanced input can be driven in the
"Line" mode.
14 • SM-500
