Re: mercotronic mdl 9800 tester.

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December 4, 2017 at 3:45 pm #68245
jeff-register
Participant

    Debe,
    Triple 5 timer is one of the oldest chips around sept the 556.
    Jeferyward, I can send a diagram of the 555 if you want. Need a solder sucker & low temp pencil & it’s easy. Look for the notch & replace in the same direction.