Cool it!

External fan or two, O2 Cool battery powered fans work great. O2 Cool. Get it?

I would ensure that the bias is correctly set first.  That would be my very first thought before fans and all that.

enjoy

bias? Please explain...
Thank you.

"Well this was winter so we put some snow in a plastic bag in between the heat sinks."

Many, if not most, of instruction manuals start with "do not expose to moisture/water" or some variation of thereof. Not that it should be mentioned, but apparently.......well, apparently not everyone reads instructions most have learned early in life. First grade of elementary school early.

While at that, do not use hair dryer in the bathtub.

Figured that would trigger someone. Did I mention it was the old Phase Linear with the huge heat sink fins? We called Carver the next day. Bob thought it was pretty clever.