Audio Innovations 500 // Vintage Integrated Tube Amplifier

The Audio Innovations Series 500 is the kind of amp that makes you question everything you thought you knew about hi-fi. Released in the late ‘80s, it was part of a movement that brought tube amps back from the dead, proving that low power, high-quality Class A valve designs could still wipe the floor with overengineered solid-state brutes. If you’ve ever wondered what pure musicality sounds like, this 25-watt, EL34-powered beauty is your answer.

Production

1986

Condition

9/10

Serial No.

55517

Orig. MSRP

£499

Restoration

• Full 30-point service check
• Cleaned controls, switches, and chassis

Factory Specs

Type   Tube Integrated Amplifier

Architecture   Class A

Power output   25W into 2 CH at 8Ω

Frequency Response   30Hz - 20kHz ±3dB

Total harmonic distortion   THD<0.15% between 80Hz-15kHz @ 1W

Tube Complement   2x ECC82 1x ECC83 2x PCC88 4x EL34 (9 total)

Power Requirements   115V AC (north american model)

Line In   Tuner / CD / Aux / Tape / Monitor

Line Out   Tape 1 / Tape 2

Speaker Outputs   4/8/16Ω

Speaker Terminals   5-way binding post

Crosstalk   Better than 78dB

Input sensitivity   400mV (max. signal voltage 3V, excluding phono)

Channel separation   > 78dB

Input impedance   100KΩ

RIAA equalizing accuracy   < 0.1dB between 20Hz - 20kHz (phono input)

Negative feedback depth   14dB

Power consumption   230W

Dimensions   17"W x 6"H x 14"D (430mm x 150mm x 350mm)

Notes   Leave at least 7" above the amp for airflow and cooling

Weight   37.5 lbs.

Documentation

Audio Innovations Series 500 Schematics

The History of Audio Innovations

Audio Innovations was founded by Peter Qvortrup and Erik Andersson in 1984. Their first products were the 800 Series power amp and matching pre. In 1986 Audio Innovations were early to reintroduce integrated valve amplifiers. The Series 500, a mid-priced 25 watt integrated, become one of the biggest selling tube amps...
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Stock No.

8926322426077