The McIntosh MC40 hardly needs an introduction. With solid American engineering, and a design that embraces the principles of classic and modern aesthetics, these monoblocks are not just amplifiers; they are a timeless expression of audio excellence. This pair is entirely cosmetically original, with very few blemishes on the transformers, and very little pitting of the chassis. Electronically, these were completely recapped as a pair by the same McIntosh technician. You would be hard-pressed to find a more sonically superb matched pair.
- Production
- 1962-69
- Condition
- 9/10
- Serial No.
- 357L4 / 418L1
- Orig. MSRP
- $159
- Restoration
- Comprehensive bench test
- Replaced RCA Input jacks
- Replaced power cords
- Recapped power supplies
- Completely recapped output stage
- Replaced 10 resistors in each output stage
- Cleaned controls, switches, and internal electronics
- Exterior detailed
- Factory Specs
Type Monophonic vacuum tube amplifier
Power output 40 watts into 8Ω (mono)
Frequency response 20Hz to 20kHz
Total harmonic distortion 0.5%
Input sensitivity 0.5V
Signal to noise ratio 90dB
Speaker load impedance 4Ω to 16Ω
Valve complement 2x 6L6GC (output), 2x 12AX7, 1x 12AU7, 1x 12BH, Solid State Rectifier
Dimensions 13.75"W x 7.75"H x 8"D
Weight 30 lbs. ea.
- Documentation
McIntosh MC40 Owner's Manual
McIntosh MC40 Service Manual
- The History of McIntosh
- Founded in 1949, McIntosh is known for offering distinguished home audio systems that deliver the ultimate experience in music and film. Offering products for two-channel stereo sound systems and multi-channel home theaters with surround sound, McIntosh continues to define the ultimate home audio entertainment...
[ Read More ]
- Liner Notes
The MC40 uses an advanced design of the McIntosh output transformer. The Unity Coupled® transformer design incorporates all of the benefits of the original McIntosh design and even further improves the power bandwidth. Leakage inductance (lack of coupling) between the primary and secondary windings of the output transformer limits the high frequency response of an amplifier. The primary and secondary windings of the McIntosh output transformer are interleaved five times to improve coupling. The interleaving is accomplished by winding groups of primary layers, then secondary layers alternately, until the total transformer is wound. Interleaving helps to extend the McIntosh power band width to over 100,000 cycles. Since 1947 his new technology has been built into every McIntosh power amplifier.
- Stock No.
- 8290131673309
The McIntosh MC40 hardly needs an introduction. With solid American engineering, and a design that embraces the principles of classic and modern aesthetics, these monoblocks are not just amplifiers; they are a timeless expression of audio excellence. This pair is entirely cosmetically original, with very few blemishes on the transformers, and very little pitting of the chassis. Electronically, these were completely recapped as a pair by the same McIntosh technician. You would be hard-pressed to find a more sonically superb matched pair.
