Aluminum nitride is a better choice for insulators than mica.? The AlN has better heat transfer, and it is almost the same as the aluminum heatsink.? Look for them in normal online places like eBay, AliExpress, or Mouser.? Look for sheets or predrilled forms for TO-220 transistors.? The way the finals are mounted in the sbitx allows for undrilled sheets.
73
Evan
AC9TU
