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Old January 8th 19, 08:56 PM posted to rec.radio.amateur.equipment
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Default Kenwood TS-450s alc problem


my ts450 has a alc problem i turn it on and it works ok for about 3 minutes and then the alc starts rising and goes out of control reset alc and power drops from 80 watts to 5 watts any thoughts? radio has never been on 11 has never been modded


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Old January 12th 19, 10:20 PM posted to rec.radio.amateur.equipment
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Default Kenwood TS-450s alc problem

On 1/9/2019 11:29 AM, Fred McKenzie wrote:
In article ,
wrote:

my ts450 has a alc problem i turn it on and it works ok for about 3 minutes
and then the alc starts rising and goes out of control reset alc and power
drops from 80 watts to 5 watts any thoughts? radio has never been on 11
has never been modded


My TS-690 is a TS-450 with Six Meters. Several years ago a problem
turned out to be caused by a leaking electrolytic capacitor. The
leakage corroded a circuit trace, opening the circuit.

My old TS-50 has numerous bad electrolytic capacitors. I gave up trying
to fix it. (I was doing more harm than good!)

Kenwood seems to have used some poor electrolytic capacitors, and they
are causing problems in their old age.

Fred
K4DII

For those of us who also follow changes in PC motherboards: A few years
ago, I'd have to do some research to get a more precise time, several of
the major, and respected, motherboard makers had problems with infant
mortality. Their electrolytics were going bad a few months after the
board was put into service. I think there was just one capacitor maker
who was responsible for most of the bad ones, but whoever it was must
have made the caps used for many of the motherboards out there! Earlier,
and later, boards from the same manufacturers had more usual failure
statistics. I remember seeing posted photos of rows of electrolytics,
filters for power supply lines, with most of their tops swelled outward.
So I wonder if these failures are related...
Bob Wilson, WA9D


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