The ZTX are bipolar devices and don't meet matching. Get them from mouser, Digikey or your favorite supplier.
Matching the IRFP240 is much easier than you may think. Especially if you buy a full tube which is usually all from the same batch. A full tube is 25 devices, about $42 at mouser. In other words you're paying an extra $28 to have enough devices to be assured of enough matching devices. Small in the big picture and you're ready for your next project. Or can sell extra matched sets.
You can match as tightly as you'd like. My last tube, all 25 were close enough to use but I was able to choose sets for my Aleph-J with Vgs matched within .001 V.
Papa has shown us how to match mosfets several times. Go visit passdiy.com and get the matching article.
Hope this helps.
Matching the IRFP240 is much easier than you may think. Especially if you buy a full tube which is usually all from the same batch. A full tube is 25 devices, about $42 at mouser. In other words you're paying an extra $28 to have enough devices to be assured of enough matching devices. Small in the big picture and you're ready for your next project. Or can sell extra matched sets.
You can match as tightly as you'd like. My last tube, all 25 were close enough to use but I was able to choose sets for my Aleph-J with Vgs matched within .001 V.
Papa has shown us how to match mosfets several times. Go visit passdiy.com and get the matching article.
Hope this helps.
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