Need help on id components

I'm rebuilding a circuit and need help to identify some components.
My electrical skills is very basic so please keep it simple

Please follow the links to view a picture of the components


1: A transistor,possibly an Op-Amp??

http://home.broadpark.no/~tclaesso/S3.jpg
http://home.broadpark.no/~tclaesso/S33.jpg

2: Unknown..maybe a switch?

http://home.broadpark.no/~tclaesso/S1.jpg
http://home.broadpark.no/~tclaesso/S11.jpg

3: Diode??

http://home.broadpark.no/~tclaesso/S2.jpg

 

It's hard to tell because the solder is so sloppy, but it looks like
most of the leads are connected together. They look like there are
actually only three, so they're probably either a power FET or a SCR
or TRIAC. One line says S AC <delta> where the S is tilted like it's
italicized, the S might be Siliconix. That leads me to believe it's a
FET.

Maybe a transistor, or again it could be a FET.

Looks like a diode or a glass capacitor.

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1: A transistor,possibly an Op-Amp??

You're right, it has been identified as a power fet SI4430 by
Vishay/Siliconix.

There is a switch connected to S1.jpg and S1.jpg is connected to the gate of
the
power fet.

---switch----####
#S1#----------Gate of powerfet--
+++++++++####

It seems like an diode, visible text on the component: 18....Ho'