Hi all
If you are skilled at wood working and can solder, you can make an amp cooling system for much less than $250. I bought two speed controlled brushless fans for $30 and added a Velleman thermostat kit for an additional $11. I mounted the fans in 3U rack mount panel under the 7100 which sits on a 3U ventillated shelf. I then built a plenum under the amp to direct the fan air stream upwards into the bottom of the amp shelf.
I changed out the pnp drive transistor on the Vellemen board with an npn to invert the drive signal so the power relay would come on at a set temperature instead of off. The electronics and the fans are powered by an inexpensive 12vdc power supply. If anyone is interested, I will be glad to help.
Regards,
TCIII

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If you are going to send someone to save the world, you better make sure they like it the way it is.