BOTH TESTED AND WORK. SMALL SCRATCHES ON TOP OF THE HPT-120AV. The Vintage Hitachi HMA-120AV Power Amplifier & HPT-120AV Preamplifier Tuner Stac is a sought-after audio equipment set from the brand Hitachi. This classic setup includes a power amplifier and a preamplifier tuner, perfect for audiophiles looking to enhance their vintage audio experience. The HMA-120AV and HPT-120AV models offer high-quality sound reproduction and are ideal for collectors of vintage audio equipment.