The Radiotehnika U-101-STEREO is a classic Soviet integrated stereo amplifier made in Riga (Latvia) starting around 1983. It was part of the “Radiotehnika 101” hi-fi system lineup. Power & load Output power: 20 W per channel (at 4 Ω) Compatible speaker impedance: typically 4–8 Ω (real-world usage) Power consumption: ~80 W Audio performance Frequency response: 20 Hz – 20,000 Hz Frequency deviation: ±1.5 dB Total harmonic distortion: ≈0.2–0.3% Signal-to-noise ratio: up to 83 dB (weighted) Channel separation: up to 50 dB (low freq) Inputs: Phono (turntable) — ~2 mV sensitivity Line inputs (tape, tuner, etc.) — ~200 mV Outputs: Speakers (2 pairs possible) Headphones Controls: Volume, balance Bass / treble tone controls (±10 dB / ±8 dB) Input selector Mono / stereo switch Physical specs Dimensions: 430 × 375 × 90 mm Weight: ~9 kg Power supply: 220 V / 50 Hz