Mark Levinson ML-9 Vintage Class AB₂ Amplifier

Description: Mark Levinson ML-9 Vintage Class AB₂ Amplifier WHO WE ARESkyFi Audio is a small startup business specializing in the purchase, reconditioning, and reselling of high end audio equipment. We only buy equipment that we admire and are passionate about. No mid-fi, no gimmicks, no junk. Each piece of equipment is cosmetically restored and fully tested in our well-equipped lab by an engineer with 30+ years of experience in the HiFi world. If it does not meet or exceed the original manufactures specifications, it will not be sold. We are very selective about the equipment we purchase, focusing on mostly analog, high-build quality, American, and European built units.Through our sister company, which is an authorized dealer for McIntosh, Audio Research, Sonus Faber, ClearAudio, Project, and Sony ES, we have access to OEM parts, service, and support.---------- Very desirable ML-9 from the early days of Mark Levinson. "designed to provide virtually the same sonic performance as the ML-3 in a component of about half the power, weight, size and price."Fully tested and delivering 100W of pure Levinson Class AB₂ power. Super clean with little signs of use. Very high current, capable of driving just about anything. Includes a pair of RCA to Camac adaptors (not pictured). More from Mark Levinson:The ML-9 is a basic stereophonic amplifier with many of the features of the higher-powered ML-3. the ML-9 is rated at 100 Watts continuous sinewave power per channel into 8 ohms, with both channels driven, from 20 Hz to 20 kHz with no more than 0.2% Total Harmonic Distortion. It will drive even the most inefficient loudspeakers to their full potential. In fact, the ML-9 will easily satisfy the power requirements of all but the most unorthodox applications. The design goal of the ML-9 was to provide the same overall performance of the Ml-3 in a component with about half the power, size and price. Thus, the audio circuitry of both models is similar. Push-pull operation is maintained from input to output. Full protection is provided for both the amplifier and the load. The power supply of the ML-9 consists of a 1,2 kVA toroidal transformer and a pair of 36 milli-Farad capacitors, allowing for energy storage in excess of 230 Joules. The damping factor can be adjusted by means of a three-position toggle switch on each channel to meet the requirements of virtually all presently available loudspeakers. The ML-9 has been designed to drive complex loads with complete stability. Circuit description The ML-9 is a high quality Class AB₂ stereophonic amplifier designed to provide virtually the same sonic performance as the ML-3 in a component of about half the power, weight, size and price. Power Supply Consists of a 1,2 kVA toroidal transformer, a 30A bridge rectifer, and two 36,000 µF capacitors. Four 520 µF capacitors are uséd for added decoupling of the pre-driver stage. Pre-Driver Stage Consists of a differential amplifier with a cascode which drives a second differential amplifier with a cascode and a current inverter. The inverter converts from balanced to ground (differential) to unbalanced to ground while maintaining push-pull operation. Driver Stage Consists of a complimentary emitter follower, driving a second complimentary emitter follower. Output Stage Consists of four parallel complimentary push-pull emitter followers Protection The on/off switch doubles as an electromagnetic circuit breaker to protect the amplifier from excessive current. The power stages are protected by an energy limiting circuit which monitors power dissipation versus time. Independent energy limiting for positive and negative information minimizes distortion while in the overload condition. This circuit offers excellent protection without effecting the sonic quality. The loudspeaker is protected by a D.C. sensing circuit that monitors the output of the amplifier. The D.C. sensing circuit is connected to the circuit breaker. Several other techniques have been employed to protect the ML-9 from external sources of damage. Selectable damping Factor Loudspeakers, like all electrical devices, are not perfect. We have determined that certain loudspeaker characteristics can be effected by varying the damping factor of the amplifier. For the reason the ML-9 is equipped with selectable damping capability. Specifications Rated Power: 100 watts continuous sine-wave power pre channel into 8 Ω with both channels driven from 20 Hz - 20 kHz with no more than ,2% T.H.D. Frequency Response: (-3 dB) 3 Hz, 44 kHz (ultra sonic filter is a modified bessel alignment) Input Impedance: 50 k Ω Voltage Gain: 26 dB Power Consumption: 400 W at rated output into 8 Ω, 50 Hz - 400 Hz (100 W at idle) Overall Dimensions (W x H x D): 482 x 216 x 339 mm (19" x 8-1/2" x 13-3/8") Weight: 29,48 kg (65 lbs) 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. Item Included Original Box No Manual Yes Remote Not Applicable Cables Yes - Power Physical Condition 7 Working Condition 10 ----------PURCHASING GUIDELINES:We do not accept or review any offers that do not go through the official eBay system. We have too many items for sale and it’s nearly impossible to keep track of offers outside of the official system. Please don’t message, email, or text any offers. All listings are eligible for eBay’s Global Shipping Program unless the item exceeds the maximum weight/price requirements to your country. If this is the case, simply message us via eBay as we can accept bank wire transfers for international payments. And we frequently ship worldwide with UPS.And please ensure your shipping address is correct within eBay as we ONLY ship to the eBay/PayPal Confirmed Shipping Address. No exceptions.TRADE IN POLICY:We accept trade-ins of equal or lesser value under certain conditions. Please visit our website to submit your gear for full consideration. We will only consider high-end equipment from mainstream manufacturers such as McIntosh, Mark Levinson, Audio Research, Krell, etc. and will typically pass on displays, projectors, receivers, dated surround processors, and mid-fi equipment of any type. We will offer a fair value for your equipment, but keep in mind we’re running a business and will need to be able to resell the equipment at a profit after investing a great deal of time and resources in testing, certifying, repairing, cleaning, and packaging the incoming equipment. If you’re looking for top dollar, we suggest selling direct on your own.SELL US YOUR GEAR (Working or Broken):We’ll also purchase your uséd or broken gear and arrange pickup if you’re in our local market. Simply visit our website to submit your gear for full consideration.SCHEDULING AN APPOINTMENT: We are currently operating from our shop inside our dedicated building in Glen Rock, NJ. You’re welcome to make an appointment if there’s a piece of equipment you’d like to see in operation before or after purchase. We have several well-equipped and dedicated listening areas, plus a dedicated listening studio with tons of equipment of all makes and models. We’re not a store, so please don’t make an appointment if you’re just curious as to how a speaker or piece of equipment sounds. In essence - no tire kickers please.You can message us here on eBay with any questions or to schedule an appointment. We can also arrange to install, calibrate, and tune your newly purchased gear in your listening room if you’re local to our area. This is super useful when purchasing large speakers or heavy amplifiers. It’s also great for ensuring your new turntable is setup correctly in its final resting place.eBay v1.3eBay integration by

Price: 2929 USD

Location: Glen Rock, New Jersey

End Time: 2024-02-26T18:17:04.000Z

Shipping Cost: 0 USD