Прочие устройства — Line Magnetic PR-4

The Line Magnetic PR-4 is an exciter supply with tube rectification, built to feed field-coil loudspeaker drivers, which need an external DC source to energise their magnets instead of relying on a permanent magnet. It belongs to the PR family of exciter supplies that Line Magnetic makes alongside its field-coil horn units.

Key specs that matter

The PR-4 is built around a 3805-type tube and runs from a 220-240V AC mains supply at 50-60Hz. The excitation output is adjustable across a wide window, from 60V to 300V DC, with excitation current settable between 30mA and 130mA DC. The chassis measures 290 x 210 x 316mm.

Engineering and use context

The broad voltage range places the PR-4 on the high-voltage side of field-coil duty, where drivers with high-resistance coils need several hundred volts at modest current. Being adjustable, one unit can be set to the specific coil rating of the driver it serves.