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WTB: Matched IRFP240 (16 off +?)

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to match that precisely you have to maintain a uniform time for each device AND uniform temperature, otherwise you're just fooling yourself. From a statistical standpoint it should be possible with one tube of 25 pieces to get +/- 0.1V, to match 16 pieces to +/- 0.01V you need about 100 devices.

fwiw, i match mine to 10 millivolts using a 1 amp constant current source (a Tektronix PS5010). Nelson shows a car battery and a resistor :)
 
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