Alan,

This is kind of apples and oranges since you are talking about  a2 KFA, 
but a late member of this list, K7RX had a 1 KFA. Sadly, he didn't live 
long enough to really enjoy his new toy, but he did post the following 
to Handihams:

http://handiham.org/manuals/Expert/SPE%20Expert%201K-FA%20solid%20state%20linear%20amp%20review%20for%20handihams.txt 


73, Steve KW3A


On 11/28/2014 4:44 PM, Alan R. Downing wrote:
> Tom, I offer this for what ever it might be worth.  I had the Ameritron
> ALS600, and after about 6 months of operation the 4 finals blew.  There was
> no fault or any other indication as to what happened.  One day when I went
> to use it there was no output.  My good friend Steve happened to have 2
> other ALS600's with blown finals, so he sent mine and his two to the factory
> for repairs.  Since I had no idea as to why the finals blew, I elected to
> sell the amp when it came back with new finals.  My reasoning was simply
> that if I didn't know what caused the meltdown, there was no way that I
> could prevent it from happening again.  Steve just bought the new Ameritron
> ALS1306, and I will be following his experience with the new model to see if
> it is any more rugged than the 600's are.I have an opportunity to buy one of
> my friend Stan's SPE 2KFA's, which are supposed to be far more rugged than
> the much less expensive Ameritron amps, and supposedly much better protected
> from serious damage.  They are also much more expensive than the Ameritron
> solid state units, so they should be much better protected as well.
>
> Best 73
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