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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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