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Proton D540

Stereo Integrated Amplifier

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Proton D540


The Proton D540 is a high current integrated amplifier which has been carefully developed with complete emphasis on the quality of sound.

Whether adding to an existing audio or video system, or as part of an all new system, you are certain to notice the clarity, detail and depth of performance which make Proton products among the best in the world, regardless of price.


Power output: 40 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.02%

Damping factor: 90

Input sensitivity: 0.2mV (MC), 2.5mV (MM), 150mV (line)

Signal to noise ratio: 75dB (MC), 92dB (MM), 105dB (line)

Dimensions: 420 x 87 x 320mm

Weight: 8.7kg



re: D540 intermit left channel drop.. relay?

I have a D540 that I absolutely love, but over time the left channel drops intermittently. Even after giving it a full switches and controls cleaning it still does it. Is there a speaker / pwr relay that needs replacing? If so, I can't find any relay replacement kits online anywhere for it. Any info is helpful.

Thank you,

Re: Proton D540 Service Manual Needed...

Hello Readers, I have one of these great old Amps, about 8 yeas ago' I had to replace the front switch Panel, the cost then' was like $150.00, now I am trying to find the rear RCA Jack Panel, over time even with cleaning, the coatings ware off causing An output indeterminacy, I hope someone has the Service Manual for this' Amp, so I can get the Right Part Number, and hopefully find a new rear RCA Jack Board.

Sincerely: George

re: Re: Proton D540 Service Manual Needed...

Hi George,
I've got a good well kept rear jack board for you. How much would you consider a fair price?

This website is not affiliated with or sponsored by Proton. To purchase D540 spares or accessories, please contact the company via their website or visit an authorised retailer.