Was told by a dealer that if I was interested in a used Threshold go for a earlier "S" as opposed to latter T series as something went wrong on latter ones.Anybody know what I am talking about?Or he was talking about?
Sean is correct. The T series used IGBT transistors which is a cross between bipolar and MOSFET. I think Toshiba and International Rectifer used to manufacture them but not anymore.
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