McIntosh MC-240

McIntosh MC 240 Vintage (Tube) Twin 40-Watt Stereo Amplifier

Serial Number: 947D7

Sold August 1961 to September 1965, 8,019 units made.

Description:

“When powered up, there was only beautiful music. The MC240/MX110 combination is pure elegance: tight base, lovely mids and balanced highs. So, here’s a toast to the fine folks at McIntosh that invented this beautiful MC240/ MX 110 combo, the fine American employees who assembled it, and the original owner. The original owners’ wife said he liked fine wine, but he loved his McIntosh, I do too.” – Todd Marlowe Audio Review Website.

This Tuner/Preamplifier was purchased new by our family in the mid- 1960s. It was paired with a Macintosh amplifier and a Crown tape recorder, a configuration found in many recording studios of that era. This unit was used primarily by the buyer, a professional singer, to make recordings which he shared with clients and friends. It was last played in the 1970’s and remained in the cabinet in the living room until it was removed about 10 months ago to be sent to R&B Electronics of Redwood City CA, for a complete evaluation and tune-up in anticipation of sale. All components were examined and tested, and R&B concluded that it was in very good condition and was operating properly; other than cleaning, little was required and none of the tubes needed replacement. A copy of the R&B receipt is available. The purchase also includes the original User’s Manual for the device.

Recommended review: kenrockwell.com/audio/mcintosh/mc240.htm

In regards to the McIntosh 240: “Get one. It should be the last amplifier you ever need. Enjoy!” – Mr. & Mrs. Ken Rockwell, Ryan and Katie.

Controls & Connectors: Chrome/ black chassis. Speaker Output: Left and Right barrier strips for 4,8 and 16 ohms. Line Output octal socket for 600 Theta/70.7V output. Stereo Preamp Power octal output socket powers McIntosh C8, C4, C104 or C108 preamps. Gain Controls: Twin AMP, Balance and Mono. Input Switch: Stereo, Twin AMP or Mono. Power Cord. Fuse 3.2A. 300 W A.C. Only outlet. Line Voltage switch: 117V or 125 V. Inputs: Stereo, Twin and Mono.

Specifications: 40w/ ch stereo, 80w mono. Response: 16-40kHz (+0 -0.1dB). Distortion: 0.5%. Noise & Hum: -90dB. Output Impedance: 4, 8, 16, 125 and 600 ohms. 600 ohm center tap internally grounded. (2,4,8, 16 and 32 ohms in mono). Output Voltages: 25 (isolated), 70.7 (one side grounded) and 140V (center tap grounded). Internal Impedance: less than 10% of rated impedance. Input Impedance: 250k. Input Sensitivity: 0.5V (in mono or twin amp). 2.0V in stereo. Unity Coupled. Power Requirements: 120V at 270 Watts.

Tubes: All original as follows: 4-6L6GC/7027A output, 3-12AX7, 2-12AU7, 2-12BH7 Solid state rectifier.

Size: 8”H x 10-3/4” W x 17-1/4”” D

Weight: 56 lb.