[Amps] Revisited: Power Combiners, cheap amps.

[Steve Thompson]

On Monday 14 July 2003 06:23, Dr. William J. Schmidt, II wrote:
> What you suggest works fine... as long as the amps remain in phase (e.g.
> make sure the input and output coax lines from the splitter and to the
> combiner are same length).   Don't bother with the resistors on the
> combiner... being tube amps, SWR on the working amp when the other fails is
> tolerable for a short period (whereas transistor amps would go south almost
> immediately).  CCI's combiners are a little under-rated... meaning they are
> a little small for CCS power.  I've used several of them on transistor
> projects with great results up to about 4 kW.

I wouldn't go without the resistors - they aren't there to control the VSWR 
that the amps see, they are there to provide isolation between the amps. 
Without resistors, you can have the makings of a very destructive oscillator 
and their cost in relation to the whole project.

Steve