Audio Innovations Series 500 Stereo Integrated Amplifier - Working

Audio Innovations Series 500 Stereo Integrated Amplifier (1987-91) in very good condition. It’s had repair service recently. WHY BUY THIS UNIT:

* Pure Class A tube sound — rich, smooth, and highly musical

* EL34 output stage — classic British tonal character

* Simple circuit design — excellent signal purity

* Strong midrange performance — ideal for vocals and acoustic music

* Vintage UK hi-fi pedigree — respected among audiophiles

* Great match for efficient speakers and analog-focused systems 

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DESCRIPTION

Audio Innovations Series 500 Integrated Tube Amplifier — a highly regarded British valve amplifier from the late 1980s/early 1990s, celebrated for its pure Class A operation and exceptionally musical sound. Designed during the golden era of UK hi-fi, the Series 500 is known for delivering a warm, natural midrange, smooth highs, and engaging tonal balance, making it a favorite among vinyl enthusiasts and tube lovers.

Using a simple, minimalist circuit with EL34 output tubes, this amplifier focuses on signal purity over complexity, resulting in a presentation that feels organic, fluid, and emotionally involving. It pairs especially well with high-efficiency speakers, where its modest power can truly shine.

SPECIFICATIONS 

Power output: 25 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.15%

Input sensitivity: 400mV (line)

Speaker load impedance: 4Ω to 8Ω

Valve complement: 4 x EL34, 3 x ECC83, 2 x ECC88

Weight: 17kg

Year: 1987

Local pick up / inspection / purchase available at Archer High Fidelity in Falls Church, VA. We are a vintage sales and service specialist covering the Washington DC metro area.

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Any other questions, please feel free to ask.