FET is bolted to the chassis. Using the insulator that came with the FET. When I swapped the FET last time I reused the insulator. Will use a new one this time.... just cuz.
![Smile :)](./images/smilies/icon_smile.gif)
I am using a very small amount of thermal grease - will make sure and clean up any excess from the previous install when I make the swap. I think I have a small TO-220 heat sink I could add to the outside of the chassis where the FET is bolted.
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Will also try a different FET (NTE2973) as that's what I have on hand.
Joe G.,
It was set-up like this: rectifier, VVR, standby, first filter cap. I've added a cap between the rectifier and the VVR. I had the same thought - would it better to have a cap before AND after??? Never thought about a MOV...hmmmm... Still, I wonder what part (if any) heat is playing...
FWIW, I've used the same set-up with the pot mounted switch in a Lite IIb and a BN Dirty 18 with no problems. The Lite IIb gets use a LOT and has never had a problem. It's in a combo with (tubes down) but has lots of ventilation.
Thanks for the input guys!!
![Cool 8)](./images/smilies/icon_cool.gif)