ASR-433

About the ASR-433

The Stromberg-Carlson ASR-433 is a vintage stereo tube integrated amplifier dating from approximately 1959–1960. Its 10-tube design uses four EL84/6BQ5 output tubes in a two-channel push-pull configuration, rated at 24 watts total output, or 12 watts per channel. Inputs include magnetic phono, ceramic phono, tape head, tuner, and auxiliary tape, while outputs accommodate 4-, 8-, and 16-ohm speakers and provide dual tape outputs. The amplifier includes continuously variable loudness, bass and treble controls, channel and stereo/monaural selection, and switchable crossover functionality. It uses a compact metal chassis intended for console or component installation, measuring approximately 13.25 inches wide, 4.5 inches high, and 13.5 inches deep. Because surviving examples are more than six decades old, safe operation generally depends on appropriate inspection, restoration, and replacement of degraded components.