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Phase Linear Dual 500

Stereo Power Amplifier

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Phase Linear Dual 500


Power output: 505 watts per channel into 8Ω (stereo)

Frequency response: 12Hz to 40kHz

Total harmonic distortion: 0.09%

Damping factor: 1000

Input sensitivity: 1.5V

Signal to noise ratio: 110dB

Speaker load impedance: 4Ω (minimum)

Dimensions: 483 x 178 x 381mm

Weight: 32kg

Year: 1978



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Reviewed Feb 19th, 2019 by Andy Liddiard

Awesome beast amps. I used to fix the heavily-modified D500's as used for the Pink Floyd Wall shows; racked and flightcased, two to a rack, power transformers relocated to the bottom of the rack and hooked in by 8-pin plugs to the amps, retapped to give + / - 128v instead of 120v on the rails.

These would produce 1kW/chan into 2 ohms nominal. The output stages had to be biased bang on for maximum sweetness, but this could (and often did) cause a couple of blown output transistors - if the biasing had been set when cold and it drifted up when hot, pop. Apart from the usual misuse from the engineer du jour.

Magic sound, though. Power, dynamics, clarity and an output damping factor that had the loudspeakers by the balls, I never heard anything back then that could remotely come close. MOSFETS sound horrible to me to this day (well, once they've got hot and pinchy), BJT just owns them and the Dual 500 does it in spades. They were my babies for a couple of years and I still cherish the memories.

Reviewed Jan 03rd, 2019 by Nato308

Excellent high power amp, Does anyone know where I can I find replacement circuit boards?

Reviewed Nov 22nd, 2018 by Quad4ever

If your looking for raw,brute power, this is exactly the amp for you. Can drive the most demanding speakers with power to spare. If you have electrostatics, I would check with the manufacturer first if it would be OK to drive them with this.



re: Dual 500

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re: Dual 500

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