IT-1220 Balanced Power Conditioner - DISCONTINUED

FEATURES

DESCRIPTION

At the heart of all three models is a specially wound and shielded toroidal isolation transformer with a center-tapped secondary. The IT-1210 is housed in a 2-unit (3.5" high) rack mount chassis; the IT-1220 and IT-1230 in a 3-unit (5.25" high) rack mount chassis. The IT-1210 and IT-1220 back panels (see drawings on overleaf) provide 12 outlets, spaced to allow clearance for "wall warts"; the front panel provides two more. The IT-1230 provides ten 20A outlets, one 30A twistlock outlet and one 30-amp twistlock inlet in back plus two 15A outlets in front. Front outlets are Ground Fault Interrupter protected. All outlets are balanced.

An IT-1210 or IT-1220 can be installed in minutes without the need for an electrician; the IT-1230 may require some help in choosing and wiring an appropriate supply cable. All three models provide clean and completely safe power -- there is no need to "lift grounds" or compromise the integrity of safety ground wires to achieve hum reduction.

Special features include an accurate, self-checking AC voltmeter that not only measures normal voltages, but also flashes eye-catching special pattern alerts for off-scale but not extreme conditions (80-90 or 130-140 volts); an Extreme Voltage Shutdown circuit to cause a protective shutdown if the unit is exposed to dangerous voltages (like accidental connection to 220V); and Furman's exclusive "Soft Start" circuit to prevent the large inrush surge currents and spikes that would otherwise occur at turn-on and turn-off with such a large transformer.

BACKGROUND

With a center-tapped isolation transformer, the AC power feeding a studio can be balanced at its source. The current-carrying wires then are no longer "hot" (120V) and "neutral" (0V), but two 60V lines of opposite polarity (referenced to the safety ground connected to the center tap), whose difference is 120V. This type of power, when run around a room, does not induce hum into nearby audio wiring, because the two conductors induce equal and opposite voltages that cancel each other out. Similarly, ground currents are all but eliminated by the same common-mode cancellation effect. No longer is it necessary to adopt cumbersome and expensive star-ground systems or use massive bus bars or heavy ground rods. All such systems are doomed to yield only mediocre results because of the impossibility of reducing the ground impedance all the way to zero. The common-mode rejection of a truly balanced AC supply is far simpler, cheaper, and more effective. Balanced power is a technology whose time has come. Balanced power is recognized by the National Electrical Code (Article 530) for technical power applications. Its use is restricted to electronic equipment only. Balanced power may not be used for lighting equipment, and access must be restricted to use by qualified personnel only. Note: Because of its 20 amp rating, the IT-1220 uses a special AC plug. Click on the link to find out what to expect, so your installation is not delayed. The IT-1230 also uses a special twist-lock power inlet.

OPTION

Specifications