In rec.audio.misc Ray Tate wrote:
: [snip]
: I've had a similar problem with an SX-850 now and then, and find that a
: periodic vigorous flipping of all the switches and rotation of all the
: knobs while operating at an elevated sound level seems to restore
: operation to normal, which leads me to conclude (as some others have)
: that the problem is the result of contact oxidation that is being burnt
: off during the process.

Thanks for the response - that's an interesting suggestion.
I just bought a new receiver (JVC RX-8040B) and the problems
I was experiencing have disappeared, thus ruling out the speakers
or speaker wire as the problem.

I'm planning to open up the old pioneer receiver and check
the contacts on the speaker switches. Hoping the restore
the receiver to a useable condition!

- Mark

--
Prof. Mark E. Glickman
Center for Health Quality, Outcomes & Economics Research
Edith Nourse Rogers Memorial Hospital (152), Bldg 70
200 Springs Road
Bedford, MA 01730

tel: (781) 687-2875
fax: (781) 687-3106
http://math.bu.edu/people/mg