A 6 year old amp emitting a burning smell is a sign that something is overheating and cooking nearby insulation or itself, like an overheating resistor. Don’t take it lightly. On a new amp burning smells may happen for a while but soon diminish - kind of like the undercoating they used to put on cars. A number of people have been becoming disenchanted with McIntosh’s reliability and quality control lately.
Burning smell
I have McIntosh 1.25 kw mono blocks. They are around 6 years old. One of them has started emitting an electrical burning smell when playing music. It doesn’t do it when just powered up, only when playing . Does anyone have a possible diagnosis of what component may be failing or what is happening ? Thanks