[R-390] Tempco

[Larry H]

The silver mica in both of mine have the printed value on them and no
colored dots.  Jacques helped me determine it is 201G03.

Regards, Larry

On Thu, Jan 17, 2019 at 6:24 PM <hamfish at comcast.net> wrote:

> Hello List,
>
>
>
> Grins & giggles I opened up an old ARRL handbook, 1960. On page 505 there
> is
> a Table 20-V, capacitor characteristic code. Interesting stuff, the sixth
> color dot indicates the tempco. So if Larry has one of those IF caps
> removed
> and can see the dots, we might have a winner? Looked up Mouser again for
> the
> 200pF, 2%, 300V values. It has a 0 to +70 tempco.
>
>
>
> Black is plus/minus 1000 ppm/deg C
>
> Brown is plus/minus 500 ppm/deg C
>
> Red is + 200 ppm/deg C
>
> Orange is +100 ppm/deg C
>
> Yellow is -20 to +100 ppm/deg C
>
> Green is 0 to +70 ppm/deg C
>
>
>
> YMMV
>
>
>
> There are 6 dots on the silver mica caps in my IF deck. Darned metal strap
> blocks the dots. Amelco is working for now, soldering iron will remain
> cold.
>
>
>
>
> Regards,
>
> Craig
>
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