Mark Levinson No. 27.5 Dual Mono Amplifier, American Vintage at its Best, Absolutely Mint

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This is by far the cleanest and most preserved ML we have seen come through our shop, regardless of model.

Best of all, this is the later No. 27.5 version with many upgrades and refinements over the standard issue No. 27.

The metalwork is just flawless and free from any signs of use. I mean perfect like the day it left the factory.

Internally we found the same results, perfect working condition.

Tested to the full 100W, where it provided perfect amplification of the test signal with very little noise or distortion.

Click here to view and add our recommended Kimber Kable branded speaker cables to your order (SkyFi is an official NEW Kimber dealer).

Plus our recommended interconnects:

Kimber RCA Interconnects

Kimber XLR Interconnects

Mark Levinson 27.5 Dual Mono Amplifier - Manual

Specifications
Peak output voltage:
48V @ rated line voltage @ 8Ω

Frequency response:
(-3dB) 4Hz, 122KHz

Input impedance:
50K ohms shunted by 1.5nF

Voltage gain:
26.9dB

Power consumption:
Typically 175W @ idle, 400W @ rated power, 8Ω

Overall dimensions:
See "Dimensions" Photo

Shipping weight:
95 lbs. (43.1kg)

Connector complement:
Two RCA-type connectors
Two XLR-type connectors
Four five-way binding posts
One IEC mains connector

The SkyFi Testing Process for Solid State Amplifiers:

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.