You wont get answer to this.Transistors do go intermittant.I had one that would make the screen go blank at 2 week intervals.I got lucky when it cut off when I had my scope tracing the circuit.I subbed a new transistor that was supposed to replace the bad one.Didnt blank out but there was a hum bar in the picture.Ordered an exact transistor and the hum bar was gone.I see no reason to put transistors in my tractor ignition.My 640 has been running fine on its point ignition for 22 years.You will have to spend another 100 bucks on a new module.Modules are potted in epoxy to keep you from seeing how few parts are in there.You have a throwaway ignition that will cost a 100 bucks every time it fails.I started working in electronics in 1951 and will not put a transistor ignition in my tractors.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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