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Hi,
I have a Kenwood KA-907 amp that has recently developed problems
(seemingly unrelated). First off, one channel (I believe it's the right
if I hooked it up correctly) has been cutting in and out and never
works at all unless the DC Coupling switch is thrown. The second
problem appears to be a mechanical problem with the on/off switch. For
a while, the off position wouldn't turn the amp totally off. I would
get no output but the power indicator light would be on. Now the switch
will physically not move down. This has all happened while the amp was
stationary and actually used rather rarely. My question is: are these
problems easily repairable and if so by who?

Additionally I'm running it through JBL L112 speakers which are killing
but the foam of the woofers of which is rapidly deteriorating (how's
that for syntax?). I've done some Googling which seems to suggest
replacing the foam might be more trouble than it's worth (I'm not
helpless with such repairs but I'm not exactly handy either). Do any
experts have opinions on whether it's worth it? If not, what are some
comparable modern speakers?

Thanks!

-Adam