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 - Tractor Operator Safety - Loader & Backhoe Operation - by Staff. Loader Operation Do not transport anyone in the loader bucket. Always carry the loader bucket low for maximum stability and visibility, whether the bucket is loaded or empty. Always use the recommended amount of counterweihting to ensure good stability. Be careful when handling large objects such as round bales, logs,
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