[Amps] SS high power for 1296 MHz ?

[Hugh]

I have a KD5FZX GS-15b cavity that I need to build into a full amp. In 
the meantime I'm still looking for ideas on converting commercial solid 
state amplifier(s) to 1296 MHz on the cheap.
It looks like there are plenty of surplus 800/900 MHz amps out there ala 
SGTF1020/1038 series but most of them appear to use internally 
compensated FETs and/or non-modifiable etched substrate stripline boards 
that will not produce decent power at 1296. I suppose that's why they 
are $60 or less :)  It would be wonderful to get 200~300w out at 1296MHz 
via SS PA without cutting off my left arm.
Any ideas ?

Hugh VA3TO