I'm surprised the copper in the primary of the "coil" didn't change more than the tungsten wire in the ballast resistor. On scopes, I left the factory Jan1, 2005. Scopes were so complex to operate then it took "Norman New Guy" right out of school to operate them. Can't imagine how they work today. I guess the knobs have disappeared and you just swipe your finger across the face to select vertical and horizontal scales and all that.
MF uses 5 amps as their break current. That's the only time I saw a number in a service manual. I have 5 Ford manuals back to the XXX engines and don't recall seeing the number they use. Course my tractors are all diesel so I have little need for such.
Nice picture JMOR. I doubt anybody has ever done what you did in showing the interaction of the inductance of the "coil" with the other parts of ignition firing. While you have everything hooked up, do everybody a favor, if you would, and put your scope V input on the black wire going to the distributor and snap a picture of the points opening with the condenser installed and without. Might give everybody an idea as to just what it does to protect the points from pitting.....Thanks.
Hey Old, I have an old Tektrinix 545 dual trace with the plug in vertical amplifiers I bought from the company surplus store 30 years ago. Don't know if it still works or not.
Hey Geo. My Yellow HF $5 cheapie works better than your red! Grin
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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