Audio Research VSi60 integrated amplifier Specifications

Sidebar 1: Specifications

Description: Tubed integrated amplifier with remote control of volume and source. Tube complement: four 6550C, two 6H30. Overall negative feedback: 7dB. Output power: 50Wpc continuous (17dBW), 20Hz–20kHz. Frequency response: 1Hz–80kHz, –3dB, at 1W. Total harmonic distortion (1kHz): typically 1.5% at 50W, 0.05% at 1W. Input sensitivity: 470mV RMS single-ended, for rated output (32.5dB gain into 8 ohms). Input impedance: 50k ohms, single-ended. Maximum input: 3.5V RMS (any input). Hum and noise: <0.1mV RMS, –106dB ref. rated output (IHF weighted). Power-supply energy storage: ca 166 joules.
Dimensions: 14" (356mm) W by 8" (203mm) H by 16" (406mm) D; rear connectors extend 0.88" (23mm) beyond chassis. Weight: 34.8 lbs (15.8kg) net, 38.3 lbs (17.4kg) shipping.
Serial Number Of Unit Reviewed: 88404605.
Price: $3995 (add $500 for tube cage). Approximate number of dealers: 25.
Manufacturer: Audio Research Corporation, 3900 Annapolis Lane N., Plymouth, MN 55447-5447. Tel: (763) 577-9700. Fax: (763) 577-0323. Web:

Audio Research Corporation
3900 Annapolis Lane N.
Plymouth, MN 55447-5447
(763) 577-9700

Nightspore68's picture

My VSi60 exploded too, twice now. Once at home, then once back at the shop AFTER they had replaced the tubes and protective resistor. I also saw the floor sample VSi60 have an explosion before I bought mine. That makes four explosions, including Stereophile's review sample.
The amp sounds great, but I'll be considering solid state next time.

artofnoise's picture

"The amplifier exceeds that specification from the 8 ohm tap into 8 ohms, with 53Wpc available (17.25dBW) at 1% THD, though only 44W (13.4dBW) were available from the 4 ohm tap into 4 ohms at 1% THD."

13.4dBW is 22 Watts not 44W.

This amp sounds great, what a shame it is prone to self destruction :-)

John Atkinson's picture

John Atkinson wrote:
artofnoise wrote:
only 44W (13.4dBW) were available from the 4 ohm tap into 4 ohms at 1% THD.

13.4dBW is 22 Watts not 44W.

My dBW ratings follow the convention established by Martin Colloms and the late Peter W. Mitchell in the 1980s: they are referred to 2.83V (1W into 8 ohms). Thus 44W into 8 ohms is is 16.4dBW, 44W into 4 ohms is 13.4dBW. An amplifier that behaves as a perfect voltage source (the ideal) thus offers the same dBW rating into all loads, an easy paradigm to grasp.

John Atkinson

Editor, Stereophile

Scandinavian classical musician's picture


Does Your measurements mean that the amplifier will not work well with my "unusual" Supra cables (Sword), and must use 8 ohm to my KEF LS50 speakers? I suppose the Supra Sword between the ARC and my NAD M51 will not be affected with any problems in technical matters?

Thank you