Hammond 144S 20K to 8 Ohm Chassis Mount Output Audio Transformer

The 144S is an output audio transformer in the 143-146 Series with a 20000 ohm primary and an 8 ohm secondary, the highest primary impedance among the 144 output parts. It is listed for output applications where a very high impedance stage drives an 8 ohm load.

The 144S is rated for 50 mW output with 3.5 mA primary D.C. current. D.C. resistance is 1240 ohms on the primary and 0.9 ohms on the secondary, both +/- 15%.

Mechanically, the 144S 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 1 in the series table and is listed as RoHS and REACH compliant (UPC 623980192604).