ESS TA-5650 Integrated Amplifier

The ESS TA-5650 is the integrated amplifier ESS built as a "statement" product — the company's high-end play, designed to sit alongside their famous AMT-1 "Heil" air-motion-transformer speakers. The pairing was common enough that many owners remember them together: one Audiokarma member recalled driving AMT-1s with a TA-5650 in the late 1970s and called it "a wonderful amp," while a retrospective review at Computer Audio Design described it as very musical, with a wide, deep soundstage and a natural midrange. That same owner noted it isn't a super detailed amp by modern standards, but the tonality is excellent — and another owner went further, calling it a "giant killer."

The engineering is where the TA-5650 gets interesting. It uses a complementary FET input stage, a complementary dual-differential Class-A output stage, and is fully direct-coupled. The power supply is described as massive, which makes sense given the output: 100 watts per channel RMS. Classic Audio lists the rest of the measurable specs — 0.03% THD, frequency response of 20Hz to 20kHz at +0/-0.25dB, a 100dB signal-to-noise ratio, and a damping factor of 1000, which is unusually high. Input sensitivity is 200mV into 50k ohms, and it will drive 4 to 16 ohm speakers.

Little else is documented. Production years, original price, dimensions, and weight are all unrecorded in the sources we have. The TA-5650's position relative to other ESS amplifiers is likewise unclear — no "above the TA-5600" or similar hierarchy appears anywhere. What survives is a consensus: a serious, musical integrated amp from a company better known for speakers, built without compromise and remembered fondly by those who owned it.