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Some Say the BEST Sounding Mac of em' all! MUST SEE!!!!
McIntosh MC-225 Tube Amplifier
Four RCA 7591A Output Tubes
Two Telefunken ECC82/12AU7 Tubes
Two Sylvania 12BH7A Tubes
One Telefunken ECC83/12AX7 Tube
Original McIntosh MC-225 Owner’s Manual
In the mid 1940’s Frank McIntosh headed a small firm specializing in the design and development of radio and broadcast stations. Being on the forefront of this burgeoning industry he saw the many shortcomings of the professional equipment of the day. Most notably was the need for high-powered, low distortion amplifier. Hiring engineer Gordon Gow as his assistant the duo researched and developed a landmark amplifier. The amplifier was so far superior in output and distortion specs it was at first met with disbelief. The audio test equipment of the day was not designed to test an amp of such exceeding performance characteristics. But the proof was in its performance. Word of mouth spread and demand grew thus Frank McIntosh & Gordon Gow had new day jobs and McIntosh Laboratory was born. Hindsight confirms the company introduced a new era of professional audio excellence and they were amongst the first to market professional equipment to the consumer. Thus nurturing the high-fidelity industry and spearheading it for years to come.
For more than six decades McIntosh has maintained dominance in the high-end audio industry. They are the only surviving “foundational” high fidelity equipment manufacturer around today, still headquartered in Binghamton, New York, with operation and manufacturing carried out in the same method of the originators. McIntosh’s permanence in the marketplace is owed to its history of phenomenal components, all adhering to the same design criterion set forth by Frank McIntosh and Gordon Gow; superior sonic performance and unmatched reliability. Every component was created with capacity so great that it will never be operated at or near its stress point. A good reason why an estimated 80% of the McIntosh components produced since 1949 are still in use today and what’s more amazing is these same components are outperforming modern counterparts with the benefit of years of technological progression. When you buy a McIntosh you’re buying a lifetime component!
The MC-225 was introduced in 1961 with a production run until 1970. It was released about the same time as its two larger siblings, the MC-240 and the MC-275, and although it had the lowest power output of the 3 it is largely viewed as the best sounding of the trio, and quite possibly the finest sounding McIntosh tube amp ever produced.
The 225 utilizes McIntosh exclusive technologies which maximize the sonic potential of the 7591 output tube. The Unity Coupled output circuit and bifilar transformer eliminates notch distortion, a troublesome distortion common to all push-pull tube amps, by coupling both output tubes almost to perfection. In the McIntosh transformer the extremely close coupling of the bifilar windings removes the condition which permits notch distortion. Furthermore the output tubes are arranged as partial cathode followers. Half of the output circuit is in the cathode and half in the plate of each tube. The output tubes now are operating in a local feedback loop which reduces their distortion, reduces their internal generator resistance, and reduces their balance requirements. The McIntosh circuit in reality perfects push-pull high efficiency output circuits.
The craze over this amp is not without reason; in terms of sonic performance and build quality it is arguably one of the top two or three amps ever produced. Its sound is downright magical, smooth, and sweet, with the ability to portray the life and emotion of music. Its midrange is pure delight, vocals and instruments are rendered with a naturalness and accurateness that sends a shiver down your spine. Bass is tight and tuneful while high frequencies are delivered it the fullest of detail. The quality of dynamic drive is also amazing. It punches out the music in a lively, exciting way.
The MC-225 represents golden era American ingenuity at its finest and is a perfect demonstration of the “McIntosh sound”. It is a perfect match for horn based and other equally efficient speaker system
McIntosh MC-225 ****Please view in full 1080p by checking appropriate resolution in settings box****
Stereo or twin amplifier: 25 watts continuous per channel Monophonic: 50 watts continuous
Less than 0.5% at rated output or less, 20 cycles through 20,000 cycles. Typical performance is 0.3% or less at 20 cycles and 20,000 cycles at full power. Typical performance in the mid frequencies is 0.1% or less at full power.
Less than 0.5% for any combination of frequencies from 20 cycles through 20,000 cycles if instantaneous peak power is below twice the rated power
Less than ±15° 20 cycles through 20,000 cycles
At rated output: +0, -0.1 db 18 cycles through 30,000 cycles +0, -0.5 db 18 cycles through 60,000 cycles At one-half rated output: +0, -1 db 14 cycles through 100,000 cycles
Noise and Hum
90 db or more below rated output
Stereo or Twin Amp:(Center tap internally grounded) 600 ohms (One side internally grounded) 4 ohms, 8 ohms, 16 ohms, 150 ohms, 200 ohms Mono: (Center tap internally grounded) 300 ohms (One side internally grounded) 75 ohms, 100 ohms
One side grounded Stereo (or twin amplifier): 25 and 70.7 volts Mono (single channel): 25 and 70.7 volts
Less than 10% of rated load impedance
Input impedance: 250,000 ohms Input sensitivity: 0.5 volts to 30 volts through gain control. 2.0 volts with gain control turned to dot indicator
117 volts AC, 50/60 cps Uses 200 watts at rated output; 85 watts at zero signal output.
Amp is clean; no rust or corrosion. Chrome looks great, only minor scratches can be found when looking closely. The lettering is very frail on this amp because of age. It wipes off very easy. As you can see in a few spots, mainly on the back panel, lettering is gone. The black bottom has minor pair ware on the back. All tubes were tested and measure very strong. Amp was tested and sounds amazing. Both channels play strong and loud with no hum or distortion.
This is a No Reserve Auction so it will go to the highest bidder.
I specialize in shipping large delicate items and I know what it will take to pack this right. All you have to pay towards shipping, insurance, packaging material, and expert packing is $39.75 to anywhere in the continental U.S. I will also ship this unit World Wide and will only charge the Actual Shipping cost.
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