When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
McIntosh Mac4100 Receiver
Very nice Mac4100. I bought this from the original owner several years ago and have enjoyed owning it. This unit is functional - all speaker outputs have been tested and all inputs have been tested and work. The front faceplate and glass are in very good condition with some very minor wear evident. The top and side panels are in good condition. Some small nicks here and there. The back corners show a bit of wear but it's not very noticeable. The veneer was peeling on the right rear bottom corner. I carefully glued it back down. It's hard to notice but I want to mention it here.
This unit is almost 40 years old and has likely never been serviced. You can see the interior shots show a good deal of dust buildup that will need to be dealt with at some point. There is no corrosion evident and no bulging capacitors or other trouble spots that I can see readily.
Comes with the original owners manual and service manual as well as a period dealer brochure.
This unit is very heavy and shipping will be expensive. I have listed it at $75 flat (US Ground). Please do not pay until I send an invoice. I only charge or actual shipping costs and yours may be lower. Local pickup in Redmond Washington can be arranged. I will also be happy to use your shipping account with FedEx/UPS/DHL if you desire.
I use brand new double-walled cardboard boxes and a combination of foam and other appropriate packing materials. This will be insured for the sales price.
I will answer all questions as quickly as possible.
Thanks for looking.
From HiFi Engine:
Description
The phono amplifier in the MAC4100 uses a new high technology integrated circuit operational amplifier. Its differential input stage has been optimized for low noise and low distortion performance.
Electronic input selector switching uses field effect analogue switches. The mechanical input selector simply switches small amounts of DC which turn the FET analogue switches off or on. This design eliminates degradation of frequency response and also eliminates noise pickup from long signal paths necessary with conventional mechanical switching. It means, as well, that switch clicks and pops have been eliminated.
The equalizer amplifier is constructed with ion implanted junction field effect operational amplifiers. These new devices amplify signals with a 6 dB better signal to noise ratio than their bipolar counterparts.
Amplifiers are capable of delivering large quantities of power when they are driven to clipping. Clipping is caused when the amplifier is asked to produce more power output than it can deliver with low distortion.
The MAC4100 has a built-in waveform comparator that compares the wave shape of the input signal with the output signal. If the disparity between the two signals exceeds 0.5% a front panel signal illuminates in red at the top of the power output indicators, with any further increase in distortion the Power Guard circuit will operate.
Specifications
Tuning range: FM, MW
Power output: 75 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.05%
Damping factor: 30
Input sensitivity: 2mV (MM), 250mV (line)
Signal to noise ratio: 80dB (MM), 90dB (line)
Output: 250mV (line)
Speaker load impedance: 4Ω to 8Ω
Semiconductors: 31 x IC, 45 x transistors, 62 x diodes, 1 x SCR
Dimensions: 473 x 165 x 394mm
Weight: 19kg
Finish: satin silver front panel, walnut grained vinyl cabinet
Year: 1978