In article , Boris Mohar says...

Yes. Weller tips cycle the mechanical switch in the handle. Metcal tips use
curie point to continuously affect the amount of absorbed RF energy.

The weller tips also use the curie point, but as you say to
affect the switch in the handle.

I work with a *lot* of MOS and otherwise static sensitive devices,
and I've never had one of the weller irons like that cause a problem.
In fact they're my preferred iron, the variable temp weller ones
just don't last more than a year, and I don't like the 'feel'
of the metcal ones.

The handle's just not 'right.'

Jim


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