Hammond 144D 300CT to 3.2 Ohm Chassis Mount Output Audio Transformer

The 144D is a 143-146 Series output transformer with a 300 ohm center-tapped primary and a 3.2 ohm secondary. It is listed for output applications in chassis mounted audio equipment and mounts with a two hole horizontal bracket.

Output is rated at 150 mW with 9 mA primary D.C. current. D.C. resistance is 15 ohms on the primary and 0.33 ohms on the secondary, both +/- 15%.

Mechanically, the 144D is a small, economical open type transformer with a two hole horizontal bracket for chassis mounting and overall dimensions of A 1.26 in (32 mm), B 0.69 in (18 mm), C 0.69 in (18 mm) and D 1.06 in (27 mm). It uses insulated, color coded flexible leads at least 4" long, and net weight is 0.5 oz. Where a P.C. board mounted version of this style is needed, the manufacturer refers to the 148 and 149 series.

Frequency response is 150 Hz to 15 kHz within +/- 1 dB, referenced to 1000 Hz. The manufacturer notes that operating at impedances below nominal lowers power capability and frequency spectrum proportionately, while higher impedances raise them. It follows schematic 3 in the series table and is listed as RoHS and REACH compliant (UPC 623980191706).