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KT 7500 audio on and off

184.174.150.82
Posted on January 13, 2015 at 08:26:16
louie3
 Help...I have a Kenwood KT 7500 that loses audio output periodically...does not lose the station, but audio output is in and out.

Basically stock except that someone has "modified" the power switch so the tuner stays on all the time it is plugged in.

And a small toggle switch has been added to the front panel which allows the panel lights (not the leds for the stereo etc) to be turned off.

Sounds great when it sounds at all.

Any suggestions would be appreciated. Thanks

 

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Does it still happen with FM muting "off..., posted on January 13, 2015 at 08:55:05
mhardy6647
Audiophile

Posts: 16018
Location: New England
Joined: October 12, 1999
Contributor
  Since: October 23, 2016
 or when set to FM mono?

If the FM interstation "hiss" muting is switched on, and the signal's borderline, the output may periodically lapse into silence.

You probably knew that already, but it is the simplest place to start.

If the problem goes away with muting switchted off or if the reception mode is set to FM mono, the solution(s) may be.

Increase FM muting threshold

Reorient antenna

Raise antenna height

Improve antenna (best will be an outdoor-mounted FM Yagi or other directional design, with a rotator and mounted as high as possible).

Have tuner serviced ('aligned')

If you don't have them, docs for the KT-7500 are available for free downloading (registration required) at the link below.

all the best,
mrh

 

RE: Does it still happen with FM muting "off..., posted on January 13, 2015 at 09:24:53
louie3
 Thanks for your suggestions. I am reasonably sure something is wrong in the actual audio output section.

When it loses audio output, the tuning meter(s) stay exactly where they were, no movement.

If there was a reception/antenna problem wouldn't you see movement in the tuning meters when the sound was lost?

Muting is off.

 

RE: KT 7500 audio on and off, posted on January 13, 2015 at 12:12:43
Todd A.
 Are you using the variable outputs? If so, try the fixed.

 

ooh, good suggestion!, posted on January 13, 2015 at 18:58:36
mhardy6647
Audiophile

Posts: 16018
Location: New England
Joined: October 12, 1999
Contributor
  Since: October 23, 2016
 ...could be that the ganged pot on the attenuator is dirty and in need of cleaning.
all the best,
mrh

 

RE: KT 7500 audio on and off, posted on January 13, 2015 at 19:26:38
louie3
 Yeah, I was hoping it was a bad spot on the level control. But nope, tried that the first thing.

I suspect it is a component in the audio output section. Not sure whether the tuner is worth spending a lot of money on.

I can put it in the system and it will work fine for a couple of hours or longer, then nothing.

 

RE: ooh, good suggestion!, posted on January 13, 2015 at 19:28:28
louie3
 See my response above. It has got to be something like that, maybe a bad cap. There are about two gazillion little electrolytics in the circuitry.

 

"two gazillion electrolytics", posted on January 14, 2015 at 06:57:55
mhardy6647
Audiophile

Posts: 16018
Location: New England
Joined: October 12, 1999
Contributor
  Since: October 23, 2016
 Yup -- something about solid state circuit design seemed to make electrolytics start breeding like flies ;-)

The KT-7500's a pretty good tuner -- it might be worth spending some lucre on -- or, in this day and age, it might be easier to just snag another decent tuner (they're not exactly in high demand any more) and move on.


all the best,
mrh

 

RE: ooh, good suggestion!, posted on January 14, 2015 at 07:19:29
Todd A.
 A couple of options on CL in central Minnesota:

http://minneapolis.craigslist.org/dak/ele/4822748377.html
http://stcloud.craigslist.org/ele/4836723650.html

Maybe you could talk one of them into shipping. It's hard to say, since most people seem to use CL because they don't want to deal with the whole online transaction thing. Might be worth a shot, though.

 

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