Successors for Toshiba's IGBT's GT20D201-GT20D101 used e.g. in Elektor's CFB Amp

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No, R25=15 ohms and R24=150 ohms. The output stage is configured for voltage gain. This is the same as Elektor's HEXFET amp and it tends to oscillate. The fix published later has however, been successfully tried by some others. I have the boards all assembled and the outputs blown but have not tried the fix yet.
 
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