Heathkit clock

[tesla]

I have a Heathkit GC-1005 clock. Built it in 1973, and it still works! But, I have a problem. At the 1 O'clock hour, the first digit usually goes out, and sometimes flickers. I suspect the Mostek IC that it has. Does anyone have a source for them??

Also, I picked up another heathkit clock that *looks* identical, but has a different p/n. It is a GC-1094. Anyone know the difference? 

Thanks,

Gene lambert

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