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    MAC 4275 speaker relay??

    I had this exact same problem and had the Speaker Relay replaced. Its available from McIntosh p/n 087 043 and it replaces the original p/n 310 182. See p.10 of the Service Manual which you can find on line. With this update the crackling and drop outs have ceased.
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    McIntosh 4275 Memory Preset Issue

    My 4275 Receiver will not retain station memory presets for more than 24 hours with the receiver off but otherwise plugged in. I suspect a capacitor is at issue as I can't find any batteries referenced in the service manual. Does anyone have any comments/solutions?
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