[hyounce]

Thanks, Codefox,

I've done the XXL swap and microphonics check to no avail. The multi-wafer switch looks pretty good, and I have blasted it with deoxit and scrubbed down what I could get to without removing the complex. As I mentioned, the motorboating problem was corrected when I found a portion on the B+ circuit to be not yet soldered - a function of the late night repair activities.
I live in the East county of San Diego, in the local mountain community of Julian, and AM reception in not the greatest. I get probably half a dozen listenable AM stations, and of course the ever present evening blasting and over-riding stations that come in from Mexico. See my response to John for more information.

Henry