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Proton amps - $1,500 (Federal Way)
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The Proton AA-1150 is a well-regarded vintage stereo power amplifier from the 1980s, known for its solid 50 watts per channel output, dual-mono power supply, Power Envelope™ technology, and distinctive green backlit power meters, offering impressive sound quality and dynamic power for its class, often praised for its clean design and performance with difficult speaker loads, making it a sought-after piece in the used audio market for its musicality and value.
Key Features & Specs:
Power Output: 50 watts per channel into 8 ohms, with dynamic power up to 400W into 8 ohms.
Design: True dual-mono power supply for improved separation and clarity.
Technology: Features Proton's Power Envelope™ for high dynamic headroom.
Meters: Large, green-lit output meters with both 0dB and +dB indicators, offering fast attack and slow decay for accurate visual feedback.
Performance: Low distortion (<=0.02% THD), wide frequency response (20Hz-20kHz ±0.3dB), and high damping factor (>150).
Connectivity: Gold-plated input jacks and three-way binding posts for speakers.
Build: Robust construction, though relatively lightweight (around 25 lbs).
Why It's Well-Regarded:
Musicality: Owners often describe its sound as musical and impressive, with detail and clarity.
Performance with Loads: Excellent at driving demanding or difficult speaker loads, reducing noise and distortion.
Value: Considered an excellent performer for its vintage price point, offering high-end features.
Things to Consider:
Age: Being a vintage unit, it may benefit from servicing (like recap kits) or require troubleshooting for issues like bad relays, as detailed in forum discussions.
Model Variation: The D-1150 was renamed the AA-1150, so they are the same product.
Overall, the Proton AA-1150 remains a respected piece of vintage audio equipment, valued for its design, performance, and sonic signature