SWR 550x, Owner'S Manual

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550x • 19
LINE FUSE (A/C OR MAINS FUSE)
This fuse is provided to protect the internal electronics against power surges, etc. It also protects the unit against itself should
one of the internal components fail. If this fuse should open, replace it with the same type of fuse and rating. Do not defeat the
purpose of this feature by using a higher rated fuse as it can void your warranty.
Proper size of the AC fuse for all countries is 3AG. Proper rating of the fuse is as follows:
United States: 8 amp slo-blo
Japan: 8 amp slo-blo
Europe (230V-240V): 4 amp slo-blo
A/C CORD RECEPTACLE
This receptacle accepts a standard A/C power cable (supplied with the 550x in the United States) used with almost all current
musical, professional and household electronic devices. We recommend great care when packing up. If your unit is not in a
rack case, put the cable in your instrument or accessory case or leave it attached and looped around one of the rack handles.
If it does become misplaced, a replacement cable can be purchased at almost any music or computer store.
NOTE : The rating for this cable is 3 conductor, 10 amperes minimum. Look for this rating on the
cable. Make sure the cable is plugged in all the way in both the amp and the wall socket.
INTERNAL FEATURE: VACUUM TUBE (VALVE)
SWR installs a specially selected 12AX7A dual triode on the preamp circuitboard of every 550x. If this tube needs replacing,
we recommend that you replace it with a similar high quality product. This tube will need replacing only if it becomes noisy or
microphonic (which sounds like glass tinkling in the background of certain notes), or completely fails (causing no signal or sig-
nal at very low levels). The tube in your 550x should last one to three years, depending on usage.
COOLING FAN
The power amp in your 550x is cooled by two methods: 1) an internal extruded aluminum heatsink; 2) an internal fan. This fan
runs constantly to ensure proper cooling of the amplifier at all times and cannot be defeated. Be sure to leave at least a 1/2"
clearance between the vent on the sides of your 550x and the sides of any rack case or enclosure in which you install your
amp. This will allow for the heat generated by internal components to escape. SWR also recommends at least one empty rack
space in your rack to allow for the best possible airflow.
NOTE
: It is normal for the cooling fan to be audible at low levels. In situations where absolute quiet is
necessary (such as in a recording studio when a cab is being miked), simply place the amplifier in a
separate room from the microphone being used for the speaker cabinet.
RACK MOUNTING INSTRUCTIONS
To preserve the beauty and reliability of your amplifier, we recommend that you install your amplifier in a rack case. The 550x
is completely ready to be rack mounted and needs no additional parts or accessories other than the rack screws and the
case itself.
The 550x takes up two full rack spaces (3 1/2"). If the rack in which you mount your 550x requires that the rubber feet on the
bottom of the chassis be removed, please remember to keep the screws handy in case you wish to reattach the rubber feet
at a later date.