[R-390] R-390-A problem

[wli]

I, too, was frustrated when my audio volume suddenly faded after being in operation for 5-30 minutes. I got led down the *garden path* thinking that being powered up had something to do with the cause. Not so. There a poor electro-mechanical connection in the phono plug. 

When the SAME phenomenon occurred a decade later: it was a loose screw on the speaker terminal strip causing an intermittent !

W. Li