Technics SU-2400 (c.1977)
The Technics SU-2400 is a late-1970s stereo pre-main (integrated) amplifier from the years when Technics was building its reputation for well-specced mid-fi separates. It was priced at ¥24,800 around 1977, which put it at the accessible end of the integrated amplifier range. Output is a modest 22W + 22W at 1 kHz into 8 ohms, taken from the period spec sheet. The unit also had a damping factor of 30 and a phono stage with 78dB signal-to-noise ratio, with maximum phono input of 130mV (1kHz).
The source record describes the SU-2400 as a pre-main amplifier with a double power meter and a 41-step master level controller. A stepped attenuator is a feature you'd normally associate with pricier gear. A second source points to its "rare black finish" and green illuminated VU meters, a combination collectors now find highly desirable. The black front panel with green meters was a striking look for the period.
Known specifications from the period listing:
- Effective output: 22W + 22W (1 kHz, both channel drive)
- Output bandwidth: 10 Hz - 40 kHz (-3dB)
- Total harmonic distortion: 0.8% (1 kHz)
- Frequency characteristic: 15 Hz - 50 kHz (+0/-3dB)
- Signal-to-noise ratio (phono): 78dB
- Damping factor: 30
- Tone controls: Bass ±10dB (100 Hz), Treble ±10dB (10 kHz)
- Power consumption: 39W
- Dimensions: 415 × 105 × 250 mm (W×H×D)
- Weight: 4.3kg
Some things are missing from the record. Explicit production years haven't been confirmed, and the "around 1977" date is tied to the price reference. No input/output counts, speaker impedance ratings or service manual details have surfaced in the Archive's research. No period reviews of this specific model have been found either, so its reliability and sound quality reputation remain undocumented. If the SU-2400's design lineage or a service manual cross-reference shows up, this page will grow accordingly.
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