ASR-433

About the ASR-433

The Stromberg Carlson ASR-433 is a tube-based integrated stereo amplifier produced around 1960. It features 10 tubes including EL84 power tubes in a push-pull configuration, delivering about 12 watts RMS per channel (some sources note up to 24 watts total output). The amplifier supports multiple inputs such as magnetic and ceramic phono, tape head, tuner, and auxiliary tape inputs. It includes tone controls with bass and treble boost and cut, a loudness control, and outputs for 4, 8, and 16 ohm speakers. The unit is housed in a metal chassis designed for building into consoles or racks, measuring approximately 13.25 x 4.5 x 13.5 inches and weighing about 25 pounds. It originally95. The amplifier is well-regarded for its warm, full sound and low noise floor, though many surviving units require capacitor replacement and maintenance due to age. Restored examples have been noted to have excellent sound quality with smooth, versatile tone controls and reliable operation. The ASR-433 is often paired with the matching ST-440 mono AM/FM tube tuner for a complete vintage hi-fi system.