Hammond 802A 50/200:125/500 Ohm Line Matching Audio Transformer

The 802A is an 800A Series broadcast-quality audio transformer for isolating and matching between different line impedances. Its primary is rated at a nominal 50/200 ohms (60/240 ohms also listed) and its secondary at 125/500 ohms (150/600 ohms also listed), stepping a low-impedance source up to a standard line impedance.

Maximum primary D.C. unbalanced current is 0.8 mA. Frequency response is +/- 0.5 dB max. from 50 Hz to 15 kHz, insertion loss is approximately 1 dB, and the maximum power level is +15 dBm with the specified characteristics, or higher with reduced low frequency performance. The series notes that when operating below nominal impedance, power capability is lower and the frequency spectrum shifts downward; at higher impedances both shift upward.

Humbucking construction helps reject stray magnetic fields, and balanced split windings on both primary and secondary give circuit versatility; the primary may be used as the secondary and vice versa for impedance matching. An electrostatic shield sits between the primary and secondary windings.

It is housed in a deep-drawn steel case with a tin plated finish and fastens with two 6-32 mounting studs, supplied with hardware. Connections are made by wire leads of at least 4" in length. Maximum overall dimensions are 1.75" (44.5 mm) wide x 1.25" (31.8 mm) deep x 2.56" (65 mm) high. The 802A is RoHS and REACH compliant. Its listed shipping weight is 0.51 lbs (0.23 kg), and it is identified by UNSPSC 39121301.