The SA-6300 and SA-6500 were Pioneer's entry-level integrated amps in the mid-1970s. The SA-6500 was rated at 25 watts per channel. Interestingly, this amp had the same low intermodulation distortion and total harmonic distortion specs as the top-of-the-line SPEC-2 amplifier, 0.1 %. So, while the buyer of this amp couldn't afford a SPEC-2, he could boast it had the same specs! The list price was $175.00.