Here is an idea from another site:
Don't run at the max rated output power of the device. Back off by 25%, 33%.
Make sure the device is running efficient (65 to 70% min DC to RF efficiency).
Tune for efficiency rather than max output power or gain.
Lower the supply voltage. This is very effective - running a 28V device at 24 or 18V volts will greatly increase its' chances of surviving a severe mismatch.
Make sure the device is adequately cooled - big heatsink with a big fan, plus a thermal cut-out on the supply if things get too hot for any reason.
Use a current limited power supply, and set the current limit, so if you're drawing 5A at 28V, set the limit for 6A.
Keeping your "finals" alive
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