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I've acquired a Kenwood 700t that is in immaculate condition, but which has one problem: after about an hour or so on a station, the green light on the dial which indicates a dead-center signal, will go out, and the sound from the previously strong station will be reduced to the faintest sound--barely audible at all. After the tuner is off for ten or fifteen minutes, the tuner will then function perfectly for another hour or so. A user from fifteen years ago on Audiokarma had this exact problem, but I've been unable to discover whether he got it fixed. Does anyone have any ideas about what the issue might be?
Follow Ups:
It does sound like a thermal problem, get yourself a can of cold spray and see if you can find a component you can barely hit and have it restore the sound. I've used playing cards and other things to barely hit just one component at a time. Surprisingly it could also be touch sensitive. Intermittent's are temperature or vibration and sometimes there is little difference with thermal expansion. Use something non conductive like a chopstick or diddle stick. When/if you find it, it may be very sensitive to touch.
Actually, one question about the cold spray. Do you have a particular type or brand? I assume this will just be cold air, and nothing else. Thanks.
I never paid attention to brand, or how it works. I suspect it has changed over the years, possibly starting with freon. But I haven't noticed any difference over the years and I've been using since the 60's.
Actually, one question about the cold spray. Do you have a particular type or brand? I assume this will just be cold air, and nothing else. Thanks.
Freeze spray discussion
Excellent--thanks for the link! Just what I was looking for.
sounds like a bad resistor of element in the tuning stack that is drifting as it warms up-
a good tuner tech s/b able to diagnose and repair -
in the course of an alignment...
Happy Listening
Thanks for the advice--much appreciated.
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