the Hafler transformers are designed to minimize this field, certain cartridges are more sensitive than others, and require separation from the amplifier. Check at a compara- tively high volume setting, swinging the tone arm through its arc. Usually a few inches of added space is all that is needed.
Line Connections and Switching
The SE-240 is normally wired for use on 120V AC power lines, as in the USA. If your line voltage is different, you will need the special Hafler export power transformer which accommodates many other line voltages. Be sure your amplifier is wired for your line voltage before you plug it in.
The SE-2403 power switch may be left on, and the amplifier switched remotely by connecting its line cord to a preamplifier (or other control center) which provides a switched AC outlet. Make sure that the control device can supply a current of 10 amperes to the SE-240, in addition to the current required by any other switched units. You may instead connect the amplifier directly to a wall outlet, and control it with its own front panel power switch.
Connecting Cables
INPUT. Conventional shielded cables, often supplied with preamplifiers, may connect the control center to the amplifier’s input jacks, Be sure the cables are not frayed or loosely connected to the plugs, and that the plugs outer shield connection is tight on the jack, to avoid hum. If you wish to install the SE-240 more than a few feet from the preamplifier, the permissible cable length to avoid loss of high frequencies is determined by the preamplifier’s output impedance and the internal capacitance of the cable. If the output impedance is 600 ohms or less, as with Hafler preamplifiers, and the cable capacitance is less than 50 picofarads per foot, up to 50 feet is acceptable. Ordinary stereo interconnecting cables often have higher capacitance, however, so a good quality low capacitance shielded wire should be used. When making long runs, keep the left and right cables close together, and avoid
