[Elecraft] Upper limits of KPA500?

[Dave Cole]

Hello,

I just got the new MMSSTV software, and will be running a bit of SSTV. 
SSTV is 100% duty cycle.

Initial testing here indicates no power level is safe...  At 150 watts 
the KPA500 reaches 70C pretty fast, in under two minutes, and 70C is my 
upper limit for testing...  At 500 watts it reaches 70C in about the 
same time...

Can I assume the amp is not the most efficient thing in the world at 200 
watts?

If the KPA500 can't deal with 100% duty cycle, for two minutes, how does 
the K3 deal with 100 watts for two minutes, at 100% duty cycle?

-- 
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources