I just sent Charles a note off-list. This morning I received replacement FETs for the MFE3002 using ECG220s. These came with a little spring around the leads keeping the leads shorted as they are high impedance. I replaced the suspect FET and the unit is working! Go figure, as I suspected I was moving the problem around and I guess the first FET I put in was bad. Anyway, I appreciate all the support and help provided by such an august group of members and will send along a plot of the device once it warms over a few days. Jerry