Other devices — Line Magnetic Audio PR-4144

The Line Magnetic PR-4144 is a vacuum-tube excitation power supply for field-coil loudspeakers, drivers whose magnetic gap is energised by an electromagnet that needs a steady external DC feed. Line Magnetic produces a range of such exciter units to accompany its field-coil horn drivers and woofers.

Key specs that matter

The PR-4144 uses an EL-6C tube and accepts a 220-240V AC mains input at 50-60Hz. Its DC output sits in the 20-24V range, the low-voltage territory used by field coils with low winding resistance. The enclosure measures 424 x 297 x 287mm.

Engineering and use context

A low-voltage exciter of this kind typically has to deliver more current than high-voltage supplies, so the PR-4144 suits drivers whose coils are specified for this low range rather than for the hundreds of volts demanded by high-resistance windings. The owner should match the output setting to the coil rating printed for the driver in use.