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i've used Kapton tape for insulation along with some good thermal paste in my Class A amp. they have been performing just fine wrt to heat dissipation.
I have the option of mica only but its use despite low thermal conductivity surprises me.
It seems the options to electrically insulate at high temperatures seem to be limited and hence a compromise....
Could you point to a source of good silicon pads ?
I fished out this from On Semiconductors regarding ways of mounting power devices on heatsinks:
i sourced it here from SP Road [Bangalore].Source of kapton tape ?
Kapton tape is said to be heat resistant too..... How would it aid in effective thermal transfer ?