Hammond 145B 600:600 Ohm Chassis Driver-Output Audio Transformer

The 145B is a 600 ohm to 600 ohm audio transformer in the 145 body of the 143-146 Series, listed for driver-output applications. With matched 600 ohm windings and a 200 mW rating, it suits chassis mounted audio equipment that needs a 600 ohm driver or output transformer.

The 145B is rated for 200 mW output with 18 mA primary D.C. current. D.C. resistance is 30 ohms on the primary and 38 ohms on the secondary, both +/- 15%.

Mechanically, the 145B is a small, economical open type transformer with a two hole horizontal bracket for chassis mounting and overall dimensions of A 1.63 in (41 mm), B 0.88 in (22 mm), C 0.81 in (21 mm) and D 1.38 in (35 mm). It uses insulated, color coded flexible leads at least 4" long, and net weight is 1.4 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 623980192802).