KPA100 smelling....

[Karsten Eppert (DK4AS)]

Hi,

I?ve been using my KPA100 for a while and suddenly had a strange smell
in my nose - like something being very hot from too many amperes. I
opened the unit, could not find anything burnt or molten but found
resistors R38/R39 in the final stage hot. I still could touch them
without burning my fingers but they were the hottest components I could
identify.

Has anybody an idea, how hot these R?s may go or whether they may heat
up at all?

73
Karsten
DK4AS
K2 #4764
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[Don Wilhelm-4]

Karsten,

R38 and R39 will get quite warm - they are rated at 3 watts for a good
reason.
Since you said they were not too hot to hold your fingers on, they are
operating well within their limits.
The other resistor that gets quite warm is R13.

73,
Don W3FPR

Karsten Eppert (DK4AS) wrote:

> Hi,
>
> I?ve been using my KPA100 for a while and suddenly had a strange smell
> in my nose - like something being very hot from too many amperes. I
> opened the unit, could not find anything burnt or molten but found
> resistors R38/R39 in the final stage hot. I still could touch them
> without burning my fingers but they were the hottest components I
> could identify.
>
> Has anybody an idea, how hot these R?s may go or whether they may heat
> up at all?
>

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