McIntosh MC75 Original // Vintage / Tube Amplifier Monoblocks / High-End Restoration

The MC75 monoblocks are the kind of amps that make seasoned audiophiles nod with quiet respect. These aren’t just show ponies—they’re pure-blooded thoroughbreds, steeped in McIntosh heritage and rebuilt for today’s most demanding ears. Classic looks? Check. 6550 tube firepower? Absolutely. Sound that’ll stop you mid-sentence? You bet.

This pair has been meticulously restored and upgraded with Mundorf and Obligato caps and custom chrome filter cans. Check under the hood!

RESTORATIONS

• All tubes test strong
• Replaced all electrolytic capacitors
• Replaced all coupling capacitors in signal path with Mundorf Evo Oils and Obligato Ultra Premiums
• Replaced all filter capacitors (check out that chrome)
• Rebuilt power supply
• Replaced thermistors
• Replaced RCA jacks
• Cleaned controls
• Verified power and distortion at 1 kHz:
• Spec: 75 watts RMS into 8 ohms @0.5%THD
• Serial Number 222B5 75.1 watts RMS into 8 ohms @0.16% THD+N
• Serial Number 222B6 75.0 watts RMS into 8 ohms @0.06% THD+N

SPECS

Type   Vacuum tube power amplifier (mono pair)

Response   16-40kHz (+0 -0.1dB)

Distortion   0.5%

Noise & Hum   -90dB

Output Impedance   4, 8, 16, 67, 150 and 600 ohms; 600 ohm balanced to ground; 4, 8 and 16 ohms isolated from ground

Output Voltages   25, 70.7, 115 and 230V; 230V winding center tapped

Internal Impedance   less than 10% of rated impedance

Input Impedance   250k

Input Sensitivity   0.5V (2.0V with gain control switched at maximum)

Transformers   Unity Coupled

Rectifier   Solid state

Dimensions   8.25"H x 8.24"W x 16.75"D

Weight   44 lbs each