At 06:41 -0500 6/17/05, Jack Gallemore wrote:
>Does running it at 110v extend the life of circuits? </Possible dumb question>

Probably not.

In those days the usual input circuit used two filter capacitors and switched 
diodes so that they were charged in series for 110 volt operation and in 
parallel for 220 volts. Either way the rest of the input circuitry sees 
220*SQRT(2) volts DC. That's about 320 V which is why they say no user 
serviceable parts inside the power converter.

It's also why 12 VDC fans replaced those connected directly to the power line 
in later Mac's

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