The Hitachi HA-3500 is an integrated amplifier produced from 1978 to 1980. It features a power consumption of 240 W and has a compact design with dimensions of 435 x 110 x 275 mm (WxHxD) and a weight of 6.0 kg. The amplifier was originally priced at approximately 420 DM. In terms of connections, it includes multiple inputs such as Tuner, Tape 1, Tape 2, and Phono, as well as outputs for two pairs of switchable speakers and a tape output. The continuous power output is rated at 2 x 30 watts into 8 ohms with a distortion factor of 0.05%. It offers dynamic power capabilities of 2 x 36 watts at 8 ohms and 2 x 38 watts at 4 ohms. Total harmonic distortion is quite low at 0.05%, with an attenuation factor of 30. The frequency response is impressive, spanning from 20 Hz to 40,000 Hz (+0.5/-1.5 dB). The signal-to-noise ratio stands at 75 dB (A-weighted) and 90 dB (unweighted), with stereo channel separation ensuring high audio fidelity. The tone control allows adjustments for bass and treble, each providing ± 10 dB at their respective frequencies of 100 Hz and 10 kHz. The amplifier also includes a loudness function and low filter settings. It supports output impedance settings of 4-16 ohms for one pair of speakers and 8-16 ohms for two pairs.
