From: Charles England III (cengland10_at_cox.net)
Date: Sat Dec 24 2005 - 18:42:46 PST
I have a TRS-80 Model I that was bought new in 1979, and it's still
running to this day. The caps you really have to
worry about are the electrolytic ones, they will eventually go bad, but
tantalum and ceramic caps will probably
be ok longer that most of us will be alive.
Electrolytics are usually the ones that are in an aluminum can, with a
black rubber plug at one end, or if your
in to old radio's, they will have a cardboard outer casing and say
something like "Sprague Atoms" on them.
If you re worried about the caps, you can replace the electrolytics
with oil filled caps or tantalums. make
sure to observe the correct values and voltage ratings, a rule of thumb
is that the voltage rating of the
cap should be 2x the voltage that it would see in the circuit that it
is in. Make sure also if the cap is
polarized or not polarized, that you get one of like kind.
Be careful of the ripple reducer caps in power supplys, some of them can
kill you. though the ones in the
newton and associated wall worts should be pretty safe.
Chuck E.
walter wrote:
>On Dec 24, 2005, at 15:15, Tony Kan wrote:
>
>
>
>>They mention that even through they hadn't been plugged in for a
>>while, the
>>machines were deteriorating because of decaying plastic insulation and
>>also
>>capacitors that eventually corrode and damage circuits.
>>
>>I got to thinking about my Newton. Any idea how long before the same
>>things
>>start happening to my babies?
>>
>>
>
>I don't know for Newtons, but for what it's worth I have an original
>Macintosh (circa 1984) that still boots from floppy and loads the OS
>and is able to run MS-Word, Macpaint, Macdraw, Page Maker (the Aldus
>version, not Adobe), etc.
>
>Walter
>
>
>
>
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