[Amps] 160m mosfet linear amplifier problem with ferrite cores

[David Cutter]

You might consider imbalance in each side of the primary which will cause a 
net dc to pass, saturation and over-heating.  This may be rubbish but it 
could get others thinking along a different path.

David
G3UNA


> HI. i have constructed this linear amplifier 500w rms (2kw pep) (50ohm) 
> with 12 mosfet irfp360, http://tzitzikas.webs.com/linear500w.jpg for 160m 
> band.
> When i gave 3watts of driving r.f power, it gave to output only 190w at 
> 106VDC (6A current). Two radio amateurs who have construct this linear 
> claim tha it gives 500w
> r.f power at 110vdc.
> But when i tried to give 4watts of driving r.f power the ferrite Cores (43 
> material)
> of transformer T3 broken! Which do you think is the problem??
>