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McIntosh MC2105

Solid State Stereo Power Amplifier (1970-75)

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McIntosh MC2105


Power output: 105 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 100kHz

Total harmonic distortion: 0.25%

Damping factor: 13

Input sensitivity: 0.5V

Signal to noise ratio: 90dB

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 34 x transistors, 18 x rectifiers and diodes

Dimensions: 411 x 181 x 368mm

Weight: 29.5kg

Finish: anodized gold and black with gold teal nomenclature


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Reviewed Oct 24th, 2018 by ronniewheels

It was the backbone of my system for many years. I watched a guy bring in his 9100 and was told it had a manufacturing issue after 8 years. Gave him a new one right there. Sold me instantly.

Reviewed Mar 24th, 2018 by jrocchio

My father bought the MC2105 in 1972-ish and paired it with the McIntosh C28. I inherited both in the 1980s. So between my dad and I this pair has been in daily use for, what, 30+ years now? They've been back to the factory once for a tune-up/check-out; but never any failures. Have always sounded lovely to me. And I have to say that I do like the 70's McIntosh look better then their current look. I currently use these with Martin Logan electrostatic speakers.

Reviewed Feb 01st, 2017 by breeeze

The 2105 is a very enjoyable reliable amp for me the past few years. My power switch broke, which is common, so I had to switch to wall strip to turn on/off. Recently, my amp started to sound a little dull, so I downloaded the schematic from HiFi and was able to trace the signal path through capacitors C9, C10 (board 043-795), that is commonly a 10uf electrolytic. I replaced these caps with large paper and oil caps that I had to mount on the forward metal bracket (behind the glass), and run lead wires to the points on the board. I thought there'd be some hum or some side effect when I powered up-- but boy was I was wrong. I want to share that this simple mod made my 2105 so much more enjoyable for me-- way more 3D/holographic and vastly increased detail in tones. In my experience, the 10uf electrolytic in C9, C10- even high quality audio electrolytic caps- hold back the 2105's potential. This is a fun reliable amp to own, and actually pretty easy to work on and modify using the schematic. I'd suggest anyone looking to add higher resolution and a more immersive experience from this amp, to address the capacitors that are in the signal path (defined in bold on the schematic) on the input section. Thanks!

Reviewed May 21st, 2015 by shawn Ince

My 2105 coupled with the MX113 preamp sounds ! well its hard to explaine. You have to get use to the Mcintosh sound ,its like no other.
I have a set of XR7's with a Mcintosh 104 EQ and what a set up. Im a JBL snob from way back but!!. just lovin it , the XR7's are everything Rouger Russels great mind could achive. I will never part with the 2105 and what ive built over the years.
Life is great in my sound room. :) Throw a nice LP on and just kick it. Five stars for the MC2105



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