Your Optimus STA-2170 is a late-1980s to early-1990s digital-synthesized AM/FM stereo receiver, sold primarily by Radio Shack/Tandy. Here are its key details:

Date & Era

• Production Years: ca. 1988–1992

• Part of Radio Shack’s Optimus line, which replaced the Realistic branding in the late ‘80s.

• This model was positioned as a mid-tier home stereo receiver with a sleek blackface design, LED power meters, and full phono input support.

Key Specifications

• Power Output: ~50 watts per channel RMS into 8 ohms (20–20,000 Hz, <0.09% THD)

• Total Harmonic Distortion: ≤0.09% (very respectable for its class)

• Inputs:

  • Phono Port (so you can plug in that beloved turntable)

  • CD/Aux

  • TV/VCR (Just labels - these could be used for other inputs)

  • Tape In/Out (monitor function - would allow you to hook up an external device like an equalizer)

• Outputs:

  • A + B speaker outputs (A/B switchable, can run simultaneously)

  • Headphone jack

• Tuner: Quartz-locked digital AM/FM with 30+ station presets

• Other Features:

  • Output Power Meter with multi-segment LED display

  • Front-panel Bass, Treble, Balance, Loudness controls

  • Speaker selector for A / B / Surround

  • Detachable AC cord (standard IEC)

• Dimensions: Approx. 17" W × 5.5" H × 13" D

• Weight: Around 18–20 lbs (solid, metal chassis)

Design & Collectability

This receiver is a great example of the late-‘80s / early-‘90s minimalist stereo aesthetic — black brushed-aluminum faceplate, chunky volume knob, and bright LED power meters that give it a “hi-fi showroom” look. It was built for durability, with a beefy power supply and decent phono stage, making it still sought-after by budget-minded vinyl enthusiasts.

Condition:

• Used, Tested, Working.

• Cleaned / Clean

• See finger point pics for any cosmetic blemishes - the unit was bumped at the lower, left, corner and has a small dent. (see pics).

• Fully functional phono stage

• I package well and ship out daily!