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Seller Store skyfiaudio
(455) 100.0%,

Location: Glen Rock, New Jersey
Ships to: US,
Item: 296813368422

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McIntosh:McIntosh
MPN:MC2505
MC2505:MC2505

McIntosh MC2505 Vintage Solid State Amplifier McIntosh MC2505 Vintage Solid State Amplifier General: The MC2505 can provide a nice clean 50W per side, perfect for getting the most out of your high-efficiency speakers. Featuring that signature vintage warm & sweet McIntosh sound as you would expect from other models from this era. Plus gorgeous traditional blue meters like most desirable McIntosh amplifiers. We were playing period-correct hits from Frank Sinatra and I was personally mesmerized at the spaciousness of his voice against the orchestra with this amp. Even at low volume. This MC2505 is not in perfect cosmetic condition, but is functioning well and ready for many more hours of music playback. SkyFi Cosmetic Notes: This MC2505 came to us in rough cosmetic condition but we made it look great. The chassis has some light oxidation but the transformers and meter cover have all been painted black and no longer have their stickers. The glass was replaced at some point in the past with a clean piece. This is a very early version of the MC2505 with angled meter bezels. The replacement glass is the new style with a small viewing window. SkyFi Technical Notes: This amplifier is currently functioning as designed. It was serviced in the past which was evident by some replaced transistors on the driver boards and newer electrolytic capacitors on the input board. The age of the replacement parts suggests the last service took place around the 1990’s. We cleaned the controls, calibrated the meters, and checked both amplifier channels for proper performance. Brand Background: McIntosh Laboratory is an American manufacturer of handcrafted high-end audio equipment based in Binghamton, New York. The company was founded in 1949 by Frank McIntosh. The company designs and produces audio amplifiers, stereo tuners and other consumer electronics products. Ownership: Single Owner Connections: RCA input, AC power outlet, General Sound: Smooth, uncolored, undistorted natural and clean Cosmetic Condition: 5/10 = Average. Multiple scratches, including some on the front faceplate. Working Condition: Working perfectly and tested in our lab and listening room. Included: Just the Unit Packing: Will be packed using our highly developed in-house process and custom packing materials. Specs: Power output: 50 watts per channel into 8Ω (stereo) Frequency response: 20 Hz to 20 kHz Total harmonic distortion: 0.25% Damping factor: 10 Input sensitivity: 0.5V Signal to noise ratio: 90 dB Speaker load impedance: 4Ω to 16Ω Dimensions: Size: 5-7/16″H, 16″W and 13″D Weight: 38 lbs. Approximate Age: 1967 Testing Process: We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR. If the amplifier passes visual inspection, we move on to a controlled power on sequence using a Sencore safety analyzer to monitor current draw in real time. Once the amplifier is determined to be safe to operate, we connect it to full AC mains for function and power testing. We connect the speaker outputs of the amplifier to a Sencore PA81 Power Analyzer which acts as a dummy load, DC offset monitor, and oscilloscope interface. We start with a low level 1 KHz test signal at the amplifier’s input and slowly increase its amplitude while monitoring the output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. If the device under test has both balanced and single ended inputs they are both tested at this time. We finish off the bench evaluation with a 1 KHz square wave check and a 20 Hz to 20 KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention. Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics. If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours minimum. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when the unit has fully come up to temperature. ———————————————————————– *Please note we are not a repair shop and only restore what we own. ———- SkyFi Audio – Curators of Vintage Audio Gear SkyFi 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. ———- PURCHASING GUIDELINES: 1) This item will be professionally packaged and insured for safe transit to your home unless you opt for local pickup from our shop. All local pickup items are only wrapped in industrial strength clear stretch wrap if the original manufacturer packaging is unavailable. Local pickup is available in Glen Rock, NJ, 07452, just a half hour drive from Midtown Manhattan, with convenient parking near our building. If we don’t have the original packaging, we use heavy-duty double-ply corrugated boxes with custom made to your item SealedAir Instapak expanding foam custom inserts. In many cases this has proven to be better than the original packaging! We also use high quality fiber reinforced tape to seal our packages. Lightweight items will be bubble wrapped and shipped in a high-quality box. 2) We will not review or accept 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 do not message, email, or text any offers. 3) Please ensure your shipping address is correct within eBay as we will ONLY ship to the eBay/PayPal Confirmed Shipping Address. No exceptions. 4) eBay may charge and collect sales tax to your state/jurisdiction which we have no control over. eBay v1.91BH &times &times &times &times &times &times &times &times &times &times &times Buy now and save! Tell a friend Visit store Watch now Postage info UPS Ground – $0.00 Local Pickup – $0.00 Click the Postage tab above the listing description for more info Additional delivery notes PICK UP OPTION Our items are available for pick-up. Pick up procedure is as follows: Purchase the item through eBay Email us to coordinate pickup PAYING VIA PAYPAL We accept PayPal on our all our items so you can shop with confidence. Simple choose the PayPal option when proceeding through the checkout. Additional Information No additional information at this time Ask seller a question You might also like Dynavector 10×3 High-Output MC Phono Cartridge Music Reference RM-5 MK II Tube Preamplifier with Phono WyWires Silver Series Phono Interconnects – 5 Pin DIN w/ XLR Connectors – 4ft Music Reference RM-9 Tube Amplifier With EL34’s Contact To contact our Customer Service Team, simply click the button here and our Customer Service team will be happy to assist. Ask seller a question © SkyFi Audio Postage Click the Postage tab above the listing description for more info Payment Accepted Payment Methods PayPal Returns Returns are not accepted Seller will pay for return shipping. eBay integration by

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