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Pin out for the XLR connector are as follows:
Pin 1 = Ground
Pin 2 = +
The SM-500 is compatible with Phantom Power-equipped mixing consoles.
XLR PAD AND GROUND LIFT
The XLR pad adjusts the level (volume) appearing at the XLR connector directly below in either the
Line or Direct mode. Volume increases as the control is turned clockwise.
If you are in the "Line" position and change the Gain control on the front panel, the level will also
change at the balanced output. You may readjust the XLR pad if necessary without affecting any
other function.
A ground lift is provided for the record out XLR Output. It is built into the XLR Pad. With the knob
on the XLR pad in the "In" position, the ground to pin one is engaged. Pulling the knob to the out
or "Ground Lift" position will interrupt or defeat the ground on pin 1.
If a persistent hum exists after trying both positions of the ground lift, there is probably a mis-wire
or bad ground in the feed lines to the board or console or a dirty or miswired AC socket. SWR rec-
ommends the purchase of an AC wall socket tester which can identify proper wiring (available at
most hardware stores). These inexpensive devices are a simple way to protect you and your
equipment from faulty electrical systems.
LINE OR MAINS FUSE
The size and rating of the line fuse is 3AG, 7 amp, slo-blo. NEVER replace this with a fuse of a
higher rating as it will void your warranty.
INTERNAL FEATURES
COOLING FAN
The SM-500 contains an internal thermostatically controlled cooling fan. When the temperature of
the heatsinks reach 50 degrees centigrade, the fan will automatically turn on and remain on until
the heatsink cools down to approximately 40 degrees centigrade. This greatly reduces component
fatigue and increases reliability.
For proper ventilation, make sure that all of the SM-500's vents are unobstructed when installing
it in a rack case.
Note: At low volume levels, the cooling fan in the SM-500 may be audible.
VACUUM TUBE (VALVE)
SWR installs a specially selected 12AX7 dual triode tube in the preamp section of every SM-500.
When it becomes time to replace it, we recommend that you do so with a similar high quality prod-
uct. This tube will need replacing only if it becomes noisey or microphonic (sounds like glass tin-
kling in the background of certain notes), or completely fails (resulting in no output).
RACK MOUNTING INSTRUCTIONS
To preserve the beauty and reliability of your amplifier, we recommend that you install your amplifi-
er in a rack case. The SM-500 is rackmountable, requiring no additional parts or accessories
other than rack screws and the rack case itself.
Pin 3 = –
SM-500 • 15
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