Mcintosh Receiver Help! My McIntosh MAC 4100 Receiver Loses Audio Output And I'm Not Good At Fixing Things?

Help! My McIntosh MAC 4100 Receiver loses audio output and I'm not good at fixing things? - mcintosh receiver

I bought a used 4100 (from the 70s?) At 4 years, makes it work, and in a cupboard. Last week I was finally able platform with some of the speakers, and it was unbelievable. On the first day there was a slight tightening of the script, and then went down the left channel. I played with him, and returned. I have for several days, approximately 2 hours per day, and it worked perfectly. Then, during the last 3 days, works well when it is lit, but less than 15 minutes there is a single light crunch, and then 5 minutes later, leaving two channels completely. When I come back hours later, ran for 15 minutes. I Reduced the "problem" to the exit, about anything that comes against the background of power meter, since no records at all, despite FM or CD player, the provision of information. Shake control entry, there is nothing, not even a crack. The meter power light work, because if you rotate the camera until the flash half-way, as he always did.