ESS (Electrostatic Sound Systems) AMP 500N Amplifier - Rare and Vintage

$999

The ESS AMP 500N is a rare model and does not come up for sale very often.

Its even RARER in the non-metered version we have here.

Putting out an impressive 500W which is reflected by the size of the heatsinks in the back, which are actually longer than the amp itself!

Gorgeous vintage looking brushed gold finish with intact lettering. No rust of signs of use anywhere.

Simple design and easy to service if ever needed. We put it through our thorough testing process, and replaced the illumination bulb.

The SkyFi Testing Process for Amplifiers (Solid State):

We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage KEF speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.

Item

Included

Original Box

No

Manual

No

Remote

N/A

Cables

Yes - Power

Physical Condition

9

Working Condition

10

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