Someone on the list has offered me x number of dollars for an Apple //
and a //+. I started working on Apple computers in 1981 in Duluth
Minnesota. One thing about the Apple // power supply was that Apple
brought a bad batch of power switches which failed at a drop of a hat.
Apple had riveted the power supply to make repairs impossible. But being
smarter then Apple, I devised a way to get the old switch replaced
without drilling the rivets out and voiding their warranty. The trick
was to use a putty knife to press in the tabs on each side of the switch
and remove it from the end. But I ran across several power supplies with
toggle switches which were the earlier // power supplies. I should have
kept those supplies but threw them away. At one time I had over 75 bad
cold colored Apple power supplies and spent hours trying to fix them. A
stroke of luck showed the weakness of the Astec power supplies. They
used a 6 volt 10 mf cap between the stages and that cap often opened
killling the supply. We started replacing that cap with a 16 volt cap
and I repaired over 90% of the dead power supplies. I thought I had it
made when Apple introduced the aluminum case power supply. But Apple
used a thompson IC which failed in that supply and it was not available
as a replacement part thus making my repair knowledge useless.
Al
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