HELP: Sansui AU-717 Amp problem
Kevin Killebrew
I've got a Sansui AU-717 Integrated SS amp, about 15 years old, that
works at normal listening levels only after the volume has momentarily
cranked way up. Amp has no sound with volume at 9 O'clock -- crank it
up to 3 O'clock and sound blasts out, then down to 9 O'clock and it
works at lower levels for a while, eventually one channel will begin to
distort and cut out untill the same procedure of turning up is
performed.
Any ideas on what this is? Perhaps a dried-up electrolytic? A friend
has an older Yamaha that does the same thing.
Any help is appreciated.
Kevin Killebrew
Mzacharias
warning - don't let someone who doesn't know what they are doing mess up the
relay(s). Replacements would be hard to find. I have often seen relays
butchered or even bypassed (BAD IDEA) by incompetent or unknowledgeable types.
Oh, yes, clean the other controls insofar as possible, and the pre-out/main-in
switch on the back of the 717 is a real troublemaker.
Mark Z.
Wichita, KS.
><HTML><PRE>Subject: HELP: Sansui AU-717 Amp problem
>From: Kevin Killebrew <kkill...@esc4.net>
>Date: Tue, Jul 28, 1998 16:02 EDT
>Message-id: <35BE2D84...@esc4.net>
Jerry G.
many things cause this type of problem. The amp would need
troubleshooting to fix it.
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Kevin Killebrew wrote in message <35BE2D84...@esc4.net>...
Tony Flores
speaker protection relay. Most older model relay types can be
taken apart, cleaned and burnished. Easy fix.
The reason it acts this way is because at low levels the signal cant jump
the dirty contact gap. Higher level, higher voltage jumps the gap.
Picture a spark plug. Of course, there should be no spark, just good
current flow. Good contact, good flow.
If you can't find the relay, just turn on the power and listen for it. It'll
click
about 3-5 seconds after power-on.
Good luck :)
Tony Sargent - CET
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Sound - the quest for perfection goes on...........forever.
Jerry G. wrote in message <35c27...@news.total.net>...
Kevin Killebrew
Kevin Killebrew
Austin, Texas
Gordon Waters
Kevin Killebrew <kkill...@esc4.net> wrote:
>Hi All,
>
>I've got a Sansui AU-717 Integrated SS amp, about 15 years old, that
>works at normal listening levels only after the volume has momentarily
>cranked way up. Amp has no sound with volume at 9 O'clock -- crank it
>up to 3 O'clock and sound blasts out, then down to 9 O'clock and it
>works at lower levels for a while, eventually one channel will begin to
>distort and cut out untill the same procedure of turning up is
>performed.
>Any ideas on what this is? Perhaps a dried-up electrolytic? A friend
>has an older Yamaha that does the same thing.
Probably a dirty relay or speaker selector switch, or possibly the source
selector has a connection problem (MUCH less likely, tho- stuff AFTER the
volume is much more probably to be the culprit). I've had this problem
with my old Pioneer SX1010 and Marantz 1152, and have fixed it by
cleaning out the switches with something like TV tuner cleaner or WD-40
(in a pinch)...
It IS possible, tho, that you've got one of those amps that is
cap-coupled on the output (single-rail power supply). IN that case, if the
big electrolytic caps that couple the amp output transistors to the speaker
start to go out, it COULD theoretically give the symptoms you describe...
Regards,
Gordon.
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