MC275 Vacuum Tube Power Amplifier

updated design

enhances the performance of a classic amplifier
Gold-Plated Unbalanced Input Jacks and Speaker Outputs Balanced XLR Input Jacks Ceramic Tube Sockets with Gold-Plated Pins Front Apron Power Switch IEC Plug-In Power Cord on Right Side Stereo/Mono Switch Taps for 4, 8, & 16-Ohm Speakers Adjustable Sensitivity on Unbalanced Inputs to Match Any Preamp Polished Stainless Steel Chassis
In 1949, McIntosh was awarded a patent for its Unity-Coupled output circuit and has been improving it ever since. The revolutionary circuit design enabled the development of audio amplifiers that produced the lowest distortion over the widest bandwidth, all without sacrificing high efficiency. The venerable MC275, arguably the most sought-after amplifier ever built, was first launched in 1961 and represented the pinnacle of vacuum tube technology. Commemorative versions, which were popular when released during the 1990s, employed the amplifiers original design. The enhanced performance of the new MC275 is the result of modern design technology and manufacturing techniques. Old-fashioned pointto-point wiring has been replaced with glass-epoxy printed circuit boards, developed through computer-aided design, which ensures lowest noise and highest operational consistency. Additional circuit refinements enable use of the widest variety of output tubes without sacrificing performance.
McIntosh Laboratory, Inc. 2 Chambers Street, Binghamton, New York 13903-2699 Tel (607) 723-3512 US Toll-Free (800) 538-6576 Fax: (607) 724-0549 www.mcintoshlabs.com
For the Consumers Protection: In order to ensure the highest level of customer satisfaction, new McIntosh products may only be purchased over-the-counter or delivered and installed by an Authorized McIntosh Dealer. McIntosh products that are purchased over the Internet, by phone or mail order are presumed to be used and do not qualify for any McIntosh Warranty. McIntosh does not warrant, in any way, products that are purchased from anyone who is not an Authorized Dealer or products that have had their serial number altered or defaced.
FULL POWER DELIVERY The MC275 Series IV delivers 75 watts per channel into 4, 8, and 16 Ohm speakers. ULTRA LOW NOISE AND DISTORTION Distortion-canceling properties of McIntoshs Unity-Coupled circuit and unique Output Transformer design yield much lower distortion and noise across the entire 20-20,000Hz music range. WIDE BANDWIDTH McIntoshs exclusive Output Circuit and Transformer designs ensure ultra-wide frequency bandwidth. MONOBLOCK The two 75-watt channels may be combined into a single channel of 150 watts into 2, 4 or 8-Ohm loads. INVERTED CHASSIS Heat producing tubes are located on top of the chassis, under a protective cage, while other circuits are shielded within the polished Stainless Steel Chassis.
POWER OUTPUT STEREO Minimum sine wave continuous average power output per channel, both channels operating is: 75 watts into 4, 8 or 16 ohm load. POWER OUTPUT MONO (PARALLEL) Minimum sine wave continuous average power output is: 150 watts into 2, 4 or 8-ohm load OUTPUT LOAD IMPEDANCE 4, 8, or 16 ohm (stereo) 2, 4, or 8 ohm (mono) RATED POWER BAND 20Hz to 20,000Hz TOTAL HARMONIC DISTORTION Maximum Total Harmonic Distortion at any power level from 250 milliwatts to rated power output is 0.5% FREQUENCY RESPONSE +0 /-0.5dB from 20Hz to 20,000Hz +0/-3dB from 10Hz to 70,000Hz SENSITIVITY 1.2V unbalanced inputs 2.5V balanced inputs

A-WEIGHTED SIGNAL-TO-NOISE RATIO 100dB INTERMODULATION DISTORTION Maximum Intermodulation Distortion if instantaneous peak output per channel does not exceed twice the rated output, for any combination of frequencies from 20Hz to 20,000Hz, with both channels operating is 0.5%. WIDE BAND DAMPING FACTOR Greater than 14 POWER REQUIREMENTS 120V, 50/60Hz, 3.6A OVERALL DIMENSIONS (H x W x D including feet and knobs) 8-1/4" (21cm) x 16-1/2" (42cm) x 12" (30.5cm) WEIGHT 67 lbs. (30.5kg) net 75 lbs. (34.1kg) boxed

04.07.MC275.20K.HP

35007100

Tube Power Amplifier

Introducing the McIntosh MC275 Tube Power Amplifier
Features 2 x 75 watts at 4/8/16 ohms or 1 x 150 watts @ 2/4/8 ohms from 20 to 20kHz at less than 0.5% THD Patented McIntosh Unity Coupled Output Circuitry and Bifilar Output Transformers Balanced and Unbalanced inputs with level controls for unbalanced inputs New detachable power cable and new power switch Original MC275 styling updated with super-mirror finish stainless steel chassis Premium tube set included Tube Compliment: 3 12AX7A inputs and phase invertors 4 12AT7 voltage amplifier and drivers 4 KT88/6550 power output Tube cage included Available: March 2004
McIntosh Laboratory, Inc.

2 Chambers St.

Binghamton, NY 13903-2699

www.mcintoshlabs.com

Handcrafted with pride in the United States by dedicated, highly trained craftspeople.

3/4/04